Consolidated Statements of Operations and Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	May 31, 2014	Jun. 01, 2013	May 31, 2014	Jun. 01, 2013
Amortization of prior service credit, tax	$ 557	$ 514	$ 1,567	$ 1,430
Amortization of net actuarial loss, tax	103	(90)	304	206
Plan amendment, tax	0	0	1,346	1,613
Unrealized appreciation of investments, tax	$ 0	$ 96	$ 91	$ 63