Business Combination (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Feb. 25, 2012 Y	Feb. 25, 2012
Business Acquisition [Line Items]
Revenue related to ATS business	$ 2,369
Income before income taxes related to ATS business	252
Acquisition related expenses	658	658
Purchase price of acquisition	31,150	31,150
Assets acquired from acquisition	21,145	21,145
Liabilities assumed in acquisition	636	636
Goodwill recognized in acquisition	10,641	10,641
Goodwill, expected tax deductible amount, amortization period, in years	15
Customer Relationships [Member]
Business Acquisition [Line Items]
Intangible assets acquired in acquisition	$ 11,700	$ 11,700
Useful life of intangible assets, in years	8