Investments and Fair Value Measurements (Fair Value Level 3 Rollforward) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	May 31, 2014	Jun. 01, 2013	May 31, 2014	Jun. 01, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	$ 0	$ 8,735	$ 2,108	$ 9,074
Transfer to Level 2	0	(4,605)	0	(4,855)
Net change included in other comprehensive income	0	255	242	166
Sales	0	0	(2,350)	0
Balance at end of period	0	4,385	0	4,385
Proceeds from the sale of investments, at par			$ 2,350	$ 250