Financing (Narrative) (Details) (USD $)	3 Months Ended
	Dec. 27, 2014	Sep. 27, 2014
Line of Credit Facility [Abstract]
Line of credit facility, borrowing capacity	$ 200,000,000
Line of Credit Facility, Expiration Date	Sep. 01, 2019
Total short-term borrowings	65,000,000	60,000,000
Letters of credit outstanding, amount	11,500,000	9,400,000
Line of credit facility, remaining borrowing capacity	$ 123,500,000	$ 130,600,000
Swing Line Of Credit [Member]
Line of Credit Facility [Abstract]
Line of credit facility, interest rate	3.25%
Variable Rate Credit Facility [Member]
Line of Credit Facility [Abstract]
Line of credit facility, interest rate	1.16%	1.15%