Quarterly report pursuant to Section 13 or 15(d)

Credit Facilities (Details Textual)

v3.10.0.1
Credit Facilities (Details Textual)
₩ in Thousands
9 Months Ended
Apr. 05, 2018
USD ($)
Sep. 29, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 29, 2018
AUD ($)
Apr. 01, 2018
USD ($)
Mar. 31, 2018
USD ($)
Mar. 30, 2018
KRW (₩)
Debt Instrument [Line Items]              
Loans maturity, description   Various          
PNC Bank, National Association, as Administrative Agent, and Lender Party [Member]              
Debt Instrument [Line Items]              
Interest expense recognized   $ 8,577,000 $ 2,982,000        
Loan maturity date   Apr. 03, 2023          
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  
Interest rate in effect       4.22%      
Shinhan Bank [Member]              
Debt Instrument [Line Items]              
Loan maturity date   Mar. 30, 2020          
Shinhan Bank [Member] | Term Loan [Member]              
Debt Instrument [Line Items]              
Credit facilities, maximum capacity | ₩             ₩ 1,000,000
Interest rate in effect       2.05%      
Loan maturity date   Mar. 30, 2020          
National Australia Bank [Member] | Revolving Credit Facility [Member]              
Debt Instrument [Line Items]              
Credit facilities, maximum capacity       $ 3,000,000      
Fixed margin interest rate       1.60%      
Credit facilities, frequency of interest payments   monthly          
Interest rate description   daily interest rate plus a fixed margin of 1.6%, 5.4%          
National Australia Bank [Member] | Revolving Credit Facility [Member] | Maximum [Member]              
Debt Instrument [Line Items]              
Interest rate in effect       5.40%      
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    
Credit facilities, quarterly term loan payment   $ 1,250,000          
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] | 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          
Other Long-Term Debt [Member] | National Australia Bank [Member]              
Debt Instrument [Line Items]              
Loans, frequency of payments   monthly          
Loans maturity, description   The loans mature at various dates through June 2023.          
Other Long-Term Debt [Member] | National Australia Bank [Member] | Maximum [Member]              
Debt Instrument [Line Items]              
Interest rates       5.10%      
Other Long-Term Debt [Member] | National Australia Bank [Member] | Minimum [Member]              
Debt Instrument [Line Items]              
Interest rates       3.90%