Additional Financial Information - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
Oct. 29, 2011	Oct. 30, 2010
Cash Flow Supplemental Disclosures [Line Items]
Non-cash capital expenditures, capitalization of fixed assets and recognition of related obligations	$ 0.9	$ 1.0

- Definition

The amount of investments that an Entity acquires in a noncash (or part noncash) acquisition. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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