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Summary of Changes in Equity (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	Oct. 30, 2010	Jul. 31, 2010
Stockholders Equity Note [Line Items]
Non-controlling interest	$ 1.5	$ 1.4

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest).

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