Debt and Capital Lease Obligations (Schedule Of Debt) (Details) - USD ($)		Jun. 02, 2018	Sep. 02, 2017
Debt Instrument [Line Items]
Capital lease and financing obligations		$ 28,163,000	$ 27,829,000
Subtotal		537,163,000	534,829,000
Less: unamortized debt issuance costs		(1,642,000)	(1,852,000)
Total debt		535,521,000	532,977,000
Less: short-term debt	[1]	(284,217,000)	(331,986,000)
Long-term debt		251,304,000	200,991,000
New Credit Facility [Member]
Debt Instrument [Line Items]
Credit Facility		284,000,000	332,000,000
Senior Notes Series A [Member] | Private Placement Debt [Member]
Debt Instrument [Line Items]
Private placement debt		75,000,000	75,000,000
Senior Notes Series B [Member] | Private Placement Debt [Member]
Debt Instrument [Line Items]
Private placement debt		100,000,000	$ 100,000,000
Prudential Note Purchase Agreement [Member]
Debt Instrument [Line Items]
Shelf Facility		$ 50,000,000

[1] Net of unamortized debt issuance costs expected to be amortized in the next twelve months.