Financing (Narrative) (Details) - USD ($)		12 Months Ended
	Oct. 03, 2015	Oct. 01, 2016	Oct. 03, 2015	Jul. 29, 2016	Jul. 05, 2016	Jul. 02, 2016
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 200,000,000		$ 200,000,000
Percent added to Adjusted LIBOR rate for one month interest period		1.00%
Short-term borrowings	21,183,000	$ 0	21,183,000
Letters of credit outstanding, amount	12,008,000		12,008,000
Line of credit facility, remaining borrowing capacity	$ 166,809,000		166,809,000
Annual excess cash flow percentage		50.00%
Net cash proceed percentage		100.00%
Commitment fees incurred on credit facility		$ 271,000	$ 209,000
Long-term debt		$ 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%
Minimum [Member]
Line of Credit Facility [Line Items]
Line of credit facility, commitment fees payable, percent	0.15%	0.25%	0.15%
Minimum [Member] | Alternate Base Rate [Member]
Line of Credit Facility [Line Items]
Effective interest rate applicable to outstanding credit facility (in hundredths)		1.75%
Maximum [Member]
Line of Credit Facility [Line Items]
Line of credit facility, commitment fees payable, percent	0.30%	0.50%	0.30%
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, borrowing capacity				$ 120,000,000	$ 100,000,000
Maximum borrowing capacity				$ 120,000,000
Short-term borrowings		$ 0
Letters of credit outstanding, amount		25,341,000
Line of credit facility, remaining borrowing capacity		$ 94,659,000
Line of credit facility, interest rate at period end (in hundredths)	1.09%	1.43%	1.09%
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Debt interest rate spread		1.00%
Variable Rate Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Debt interest rate spread	1.00%
Tangible Equity Units Senior Amortizing Note [Member]
Line of Credit Facility [Line Items]
Interest rate, percentage		8.75%				8.75%
Long-term debt		$ 28,080,000
Term Loan B Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, borrowing capacity					$ 460,000,000
Line of credit facility, interest rate at period end (in hundredths)		5.00%
Interest rate, percentage		1.00%				1.00%
Long-term debt		$ 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)		0.75%
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%
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%
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%
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%
Bank Line Of Credit Monthly Us Libor Plus100 Basis Points [Member] | Variable Rate Credit Facility [Member]
Line of Credit Facility [Line Items]
Interest rate for period	1.20%		1.20%
Test [Member]
Line of Credit Facility [Line Items]
Letters of credit outstanding, amount		$ 46,765,000
Guarantees		$ 26,536,000