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Financing (Narrative) (Details) - USD ($)
12 Months Ended
Jul. 16, 2019
Sep. 28, 2019
Sep. 29, 2018
Dec. 29, 2018
Jul. 05, 2016
Line of Credit Facility [Line Items]          
Percent added to Adjusted LIBOR rate for one month interest period   1.00%      
Commitment fees incurred on credit facility   $ 281,000 $ 342,000    
Annual excess cash flow percentage   50.00%      
Net cash proceed percentage   100.00%      
Alternate Base Rate          
Line of Credit Facility [Line Items]          
Effective interest rate applicable to outstanding credit facility (in hundredths)   2.25%      
Minimum          
Line of Credit Facility [Line Items]          
Commitment fee percentage   0.25%      
Minimum | Alternate Base Rate          
Line of Credit Facility [Line Items]          
Effective interest rate applicable to outstanding credit facility (in hundredths)   1.75%      
Maximum          
Line of Credit Facility [Line Items]          
Commitment fee percentage   0.40%      
Revolving Credit Facility          
Line of Credit Facility [Line Items]          
Line of credit facility, borrowing capacity         $ 150,000,000
Maximum borrowing capacity   $ 150,000,000 120,000,000 $ 150,000,000  
Debt issuance costs   541,000      
Short-term borrowings   0 0    
Letters of credit outstanding, amount   21,173,000 20,448,000    
Line of credit facility, remaining borrowing capacity   $ 128,827,000 $ 99,552,000    
Revolving Credit Facility | London Interbank Offered Rate (LIBOR)          
Line of Credit Facility [Line Items]          
Debt interest rate spread   1.00%      
Term Loan B Facility          
Line of Credit Facility [Line Items]          
Line of credit facility, borrowing capacity         $ 460,000,000
Debt instrument, amortization percentage   1.00% 1.00%    
Line of credit facility, interest rate at period end (in hundredths)   5.65%      
Interest rate, percentage   1.00%      
Eurocurrency Term Loans          
Line of Credit Facility [Line Items]          
Effective interest rate applicable to outstanding credit facility (in hundredths)   3.25%      
Eurocurrency Term Loans | London Interbank Offered Rate (LIBOR)          
Line of Credit Facility [Line Items]          
Effective interest rate applicable to outstanding credit facility (in hundredths)   2.06%      
Eurocurrency Term Loans | Minimum | London Interbank Offered Rate (LIBOR)          
Line of Credit Facility [Line Items]          
Effective interest rate applicable to outstanding credit facility (in hundredths)   0.75%      
Eurocurrency Revolving Loans          
Line of Credit Facility [Line Items]          
Effective interest rate applicable to outstanding credit facility (in hundredths)   3.00%      
Test & Simulation          
Line of Credit Facility [Line Items]          
Letters of credit outstanding, amount   $ 23,121,000      
Guarantees   $ 26,665,000      
5.750% Senior Unsecured Notes Due 2027 | Unsecured Debt          
Line of Credit Facility [Line Items]          
Principal amount $ 350,000,000        
Interest rate, percentage 5.75%        
Proceeds from debt, net of issuance costs $ 343,439,000        
Repurchase percentage of principal amount due to change of control 101.00%        
Repurchase percentage of principal amount due to sale of assets 100.00%