Debt and Capital Lease Obligations (Schedule Of Debt) (Details) - USD ($)		Mar. 03, 2018	Sep. 02, 2017
Debt Instrument [Line Items]
Capital lease and financing obligations		$ 28,017,000	$ 27,829,000
Subtotal		513,017,000	534,829,000
Less: unamortized debt issuance costs		(1,774,000)	(1,852,000)
Total debt		511,243,000	532,977,000
Less: short-term debt	[1]	(260,347,000)	(331,986,000)
Long-term debt		250,896,000	200,991,000
New Credit Facility [Member]
Debt Instrument [Line Items]
Credit Facility		260,000,000	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
Shelf Facility 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.