Quarterly report pursuant to Section 13 or 15(d)

Restricted Cash (Details)

v2.4.1.9
Restricted Cash (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 28, 2015
Dec. 27, 2014
Restricted Cash and Cash Equivalents Items [Line Items]    
Restricted cash $ 316us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue $ 319us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
Estimated period of restricted cash amount 2 months  
Seungwon Acquisition [Member]    
Restricted Cash and Cash Equivalents Items [Line Items]    
Restricted Cash and Cash Equivalents 271us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis
= snhy_SeungwonAcquisitionMember
 
United Kingdom [Member]    
Restricted Cash and Cash Equivalents Items [Line Items]    
Restricted Cash and Cash Equivalents $ 45us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis
= country_GB