Financing (Narrative) (Details) (USD $)	12 Months Ended
	Sep. 27, 2014	Sep. 28, 2013
Line of Credit Facility [Line Items]
Bank line of credit facility, amount outstanding	$ 60,000,000	$ 35,000,000
Letters of credit outstanding, amount	21,200,000
Line of credit facility, weighted average interest rate during period (in hundredths)	1.15%	1.57%
Line of credit facility, interest rate at period end (in hundredths)	1.15%	1.07%
Debt interest rate spread	100.00%	87.50%
Commitment fees incurred on credit facility	100,000	100,000
Guarantees outstanding, amount	24,700,000
Minimum [Member]
Line of Credit Facility [Line Items]
Line of credit facility, commitment fees payable, percent	0.15%
Maximum [Member]
Line of Credit Facility [Line Items]
Line of credit facility, commitment fees payable, percent	0.30%
Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, expiration date	Sep. 30, 2017
Line of credit facility, borrowing capacity		100,000,000
Letters of credit outstanding, amount	9,400,000	14,300,000
Line of credit facility, remaining borrowing capacity	130,600,000	50,700,000
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, expiration date	Sep. 24, 2019
Line of credit facility, borrowing capacity	$ 200,000,000
Credit facility agreement term, in years	5 years
Credit Agreement Interest Rate Scenario One [Member]
Line of Credit Facility [Line Items]
Percent added to federal funds effective rate	0.50%
Credit Agreement Interest Rate Scenario Two [Member]
Line of Credit Facility [Line Items]
Percent added to Adjusted LIBOR rate for one month interest period	1.00%
London Interbank Offering Rate [Member]
Line of Credit Facility [Line Items]
Effective interest rate applicable to outstanding credit facility (in hundredths)	0.15%
London Interbank Offering Rate [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Debt interest rate spread	1.00%
London Interbank Offering Rate [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Debt interest rate spread	1.625%
Alternate Base Rate [Member]
Line of Credit Facility [Line Items]
Effective interest rate applicable to outstanding credit facility (in hundredths)	3.25%
Alternate Base Rate [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Debt interest rate spread	0.00%
Alternate Base Rate [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Debt interest rate spread	0.625%