Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies (Details)

v2.4.1.9
Summary of Significant Accounting Policies (Details) (USD $)
Share data in Thousands, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 27, 2014
Sep. 27, 2014
Jun. 28, 2014
Mar. 29, 2014
Dec. 28, 2013
Sep. 28, 2013
Jun. 29, 2013
Mar. 30, 2013
Dec. 27, 2014
Dec. 28, 2013
Dec. 29, 2012
Property, Plant and Equipment [Line Items]                      
Reinsurance Purchased For Stop Losses On Individual Basis                 $ 155snhy_ReinsurancePurchasedForStopLossesOnIndividualBasis    
Computation of basic and diluted earnings per common share                      
Net income 10,327,000us-gaap_NetIncomeLoss 9,877,000us-gaap_NetIncomeLoss 12,186,000us-gaap_NetIncomeLoss 11,385,000us-gaap_NetIncomeLoss 8,343,000us-gaap_NetIncomeLoss 8,275,000us-gaap_NetIncomeLoss 11,790,000us-gaap_NetIncomeLoss 9,575,000us-gaap_NetIncomeLoss 43,775,000us-gaap_NetIncomeLoss 37,984,000us-gaap_NetIncomeLoss 37,398,000us-gaap_NetIncomeLoss
Weighted average basic shares outstanding                 26,456us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 26,206us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 25,944us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Basic net income per common share (in dollars per share) $ 0.39us-gaap_EarningsPerShareBasic $ 0.37us-gaap_EarningsPerShareBasic $ 0.46us-gaap_EarningsPerShareBasic $ 0.43us-gaap_EarningsPerShareBasic $ 0.32us-gaap_EarningsPerShareBasic $ 0.32us-gaap_EarningsPerShareBasic $ 0.45us-gaap_EarningsPerShareBasic $ 0.37us-gaap_EarningsPerShareBasic $ 1.65us-gaap_EarningsPerShareBasic $ 1.45us-gaap_EarningsPerShareBasic $ 1.44us-gaap_EarningsPerShareBasic
Effect of dilutive stock options                 0us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 0us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 0us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Weighted average diluted shares outstanding                 26,456us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 26,206us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 25,971us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Diluted net income per common share (in dollars per share) $ 0.39us-gaap_EarningsPerShareDiluted $ 0.37us-gaap_EarningsPerShareDiluted $ 0.46us-gaap_EarningsPerShareDiluted $ 0.43us-gaap_EarningsPerShareDiluted $ 0.32us-gaap_EarningsPerShareDiluted $ 0.32us-gaap_EarningsPerShareDiluted $ 0.45us-gaap_EarningsPerShareDiluted $ 0.37us-gaap_EarningsPerShareDiluted $ 1.65us-gaap_EarningsPerShareDiluted $ 1.45us-gaap_EarningsPerShareDiluted $ 1.44us-gaap_EarningsPerShareDiluted
Reinsurance Purchased For Stop Losses on Aggregate Basis                 $ 7,200snhy_ReinsurancePurchasedForStopLossesonAggregateBasis    
Computer Equipment [Member] | Minimum [Member]                      
Property, Plant and Equipment [Line Items]                      
Estimated useful life                 3 years    
Computer Equipment [Member] | Maximum [Member]                      
Property, Plant and Equipment [Line Items]                      
Estimated useful life                 5 years    
Machinery and equipment | Minimum [Member]                      
Property, Plant and Equipment [Line Items]                      
Estimated useful life                 4 years    
Machinery and equipment | Maximum [Member]                      
Property, Plant and Equipment [Line Items]                      
Estimated useful life                 12 years    
Furniture and Fixtures [Member] | Minimum [Member]                      
Property, Plant and Equipment [Line Items]                      
Estimated useful life                 4 years    
Furniture and Fixtures [Member] | Maximum [Member]                      
Property, Plant and Equipment [Line Items]                      
Estimated useful life                 10 years    
Buildings | Minimum [Member]                      
Property, Plant and Equipment [Line Items]                      
Estimated useful life                 25 years    
Buildings | Maximum [Member]                      
Property, Plant and Equipment [Line Items]                      
Estimated useful life                 40 years    
Leasehold and land improvements | Minimum [Member]                      
Property, Plant and Equipment [Line Items]                      
Estimated useful life                 5 years    
Leasehold and land improvements | Maximum [Member]                      
Property, Plant and Equipment [Line Items]                      
Estimated useful life                 15 years