Comprehensive Income (Reclassification out of AOCI) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Aug. 31, 2013	Aug. 25, 2012	Aug. 27, 2011
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of goods sold	$ (718,534)	$ (537,999)	$ (456,664)
Income taxes	(13,141)	34,865	(94)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, after tax	(1,962)	(2,157)
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Cost (Credit) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of goods sold	(4,493)	(3,990)
Operating expenses	(677)	(602)
Reclassifications, before tax	(5,170)	(4,592)
Income taxes	1,944	1,791
Reclassifications, after tax	(3,226)	(2,801)
Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of goods sold	1,412	896
Operating expenses	213	135
Reclassifications, before tax	1,625	1,031
Income taxes	(361)	(387)
Reclassifications, after tax	$ 1,264	$ 644