Financing (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Apr. 01, 2017	Apr. 02, 2016	Apr. 01, 2017	Apr. 02, 2016	Oct. 01, 2016	Jul. 02, 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	$ 114,000	$ 60,000	$ 215,000	$ 123,000
Annual excess cash flow percentage per credit agreement			50.00%
Net cash proceed percentage per credit agreement			100.00%
Long-term debt	$ 489,052,000		$ 489,052,000		$ 493,545,000
Alternate Base Rate [Member]
Line of Credit Facility [Line Items]
Effective interest rate applicable to outstanding credit facility (in hundredths)	3.25%		3.25%
Minimum [Member]
Line of Credit Facility [Line Items]
Line of credit facility, commitment fees payable, percent			0.25%
Minimum [Member] | Alternate Base Rate [Member]
Line of Credit Facility [Line Items]
Effective interest rate applicable to outstanding credit facility (in hundredths)	1.75%		1.75%
Maximum [Member]
Line of Credit Facility [Line Items]
Line of credit facility, commitment fees payable, percent			0.50%
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, borrowing capacity					120,000,000
Maximum borrowing capacity					120,000,000
Short-term borrowings	$ 0		$ 0
Letters of credit outstanding, amount	31,612,000		31,612,000
Line of credit facility, remaining borrowing capacity	$ 88,388,000		$ 88,388,000
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Debt interest rate spread			1.00%
Term Loan B Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, borrowing capacity					460,000,000
Interest rate, percentage	1.00%		1.00%
Weighted average interest rate	5.24%		5.24%
Long-term debt	$ 462,826,000		$ 462,826,000		465,465,000
Term Loan B Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Effective interest rate applicable to outstanding credit facility (in hundredths)	0.99%		0.99%
Term Loan B Facility [Member] | Alternate Base Rate [Member]
Line of Credit Facility [Line Items]
Effective interest rate applicable to outstanding credit facility (in hundredths)	4.25%		4.25%
Eurocurrency Borrowing [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Effective interest rate applicable to outstanding credit facility (in hundredths)	4.00%		4.00%
Eurocurrency Term Loans [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Effective interest rate applicable to outstanding credit facility (in hundredths)	4.25%		4.25%
Eurocurrency Term Loans [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Effective interest rate applicable to outstanding credit facility (in hundredths)	0.75%		0.75%
Tangible Equity Units Senior Amortizing Note [Member]
Line of Credit Facility [Line Items]
Interest rate, percentage	8.75%		8.75%			8.75%
Long-term debt	$ 26,226,000		$ 26,226,000		$ 28,080,000