Accounts Receivable Purchasing Facility - Additional Information (Details) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended
	May 31, 2012	May 26, 2017	May 27, 2016	May 26, 2017	May 27, 2016	Aug. 26, 2016
Accounts Notes And Loans Receivable [Line Items]
Receivables purchasing agreement description				All purchases of Eligible Receivables are at a discount equal to a 2-month LIBOR plus 2.75% annual discount margin, calculated on a daily basis for the number of days between the payment of the purchase price by Wells Fargo to the Sellers and the actual collection of the Eligible Receivables by Wells Fargo from the account debtor. Purchases are also subject to a 95% advance rate with the 5% being reimbursed to the Sellers upon collection by Wells Fargo from the account debtor.
Receivables purchase agreement termination date				Jun. 30, 2017
Receivables Purchasing Agreement
Accounts Notes And Loans Receivable [Line Items]
Receivable purchase advance percentage	95.00%
Receivable purchase reimbursement percentage	5.00%
Sale of accounts receivable		$ 41,200,000	$ 147,800,000	$ 153,600,000	$ 579,100,000
Outstanding balance of receivables sold and not yet collected		22,100,000		22,100,000		$ 28,500,000
Interest expense		$ 200,000	$ 500,000	$ 600,000	$ 1,600,000
2-Month LIBOR | Receivables Purchasing Agreement
Accounts Notes And Loans Receivable [Line Items]
Annual discount margin percentage	2.75%
Maximum | Receivables Purchasing Agreement
Accounts Notes And Loans Receivable [Line Items]
Aggregate outstanding balance of purchased receivable	$ 50,000,000