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Goodwill and Intangibles - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Feb. 09, 2013	Feb. 09, 2013
Finite-Lived Intangible Assets [Line Items]
Amortization expense of intangible assets	$ 0.6	$ 0.6

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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