Quarterly report pursuant to Section 13 or 15(d)

Credit Facilities (Details Textual)

v3.10.0.1
Credit Facilities (Details Textual)
₩ in Thousands
6 Months Ended
Apr. 05, 2018
USD ($)
Apr. 01, 2018
USD ($)
Jun. 30, 2018
USD ($)
Jul. 01, 2017
USD ($)
Jun. 30, 2018
KRW (₩)
Mar. 31, 2018
USD ($)
Mar. 30, 2018
KRW (₩)
Dec. 30, 2017
USD ($)
Debt Instrument [Line Items]                
Revolving line of credit     $ 256,750,000         $ 116,000,000
PNC Bank, National Association, as Administrative Agent, and Lender Party [Member]                
Debt Instrument [Line Items]                
Interest expense recognized     4,534,000 $ 1,778,000        
PNC Bank, National Association, as Administrative Agent, and Lender Party [Member] | Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Credit facilities, maximum capacity           $ 300,000,000    
Revolving line of credit     256,750,000         116,000,000
Additional credit available subject to pro forma compliance with debt covenant     $ 143,250,000         $ 184,000,000
Interest rate in effect     4.01%   4.01%      
Shinhan Bank [Member] | Term Loan [Member]                
Debt Instrument [Line Items]                
Credit facilities, maximum capacity     $ 897,000   ₩ 1,000,000   ₩ 1,000,000  
Interest rate in effect     2.05%   2.05%      
Interest expense recognized     $ 5,000          
Loan maturity date     Mar. 31, 2020          
Amended Credit Agreement [Member]                
Debt Instrument [Line Items]                
Credit facilities, maximum capacity   $ 400,000,000            
Line of credit facility term loan aggregate principal amount   100,000,000            
Accordion feature to increase maximum capacity   $ 200,000,000            
Expiration date   Apr. 03, 2023            
Amended Credit Agreement [Member] | Term Loan [Member]                
Debt Instrument [Line Items]                
Cash consideration transferred through revolving credit facility $ 258,000,000              
Amended Credit Agreement [Member] | PNC Bank, National Association, as Administrative Agent, and Lender Party [Member] | Term Loan [Member]                
Debt Instrument [Line Items]                
Balance of term loan after net of unamortized debt issuance cost     $ 97,580,000          
Amended Credit Agreement [Member] | Line of Credit Term Loan Payment on July 2, 2018 [Member]                
Debt Instrument [Line Items]                
Credit facilities, quarterly term loan payment     1,250,000          
Amended Credit Agreement [Member] | Line of Credit Term Loan Payment on July 2020 [Member]                
Debt Instrument [Line Items]                
Credit facilities, quarterly term loan payment     1,875,000          
Amended Credit Agreement [Member] | Line of Credit Term Loan Payment on July 2022 [Member]                
Debt Instrument [Line Items]                
Credit facilities, quarterly term loan payment     $ 2,500,000