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Fair Value Measurements - Change in Contingent Consideration Liability at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
	May 04, 2013	May 04, 2013
Fair Value Disclosures [Abstract]
Fair value - beginning of period	$ (23,005)
Fair value of contingent consideration issued during the period		(22,678)
Change in fair value	(528)	(855)
Fair value - end of period	$ (23,533)	$ (23,533)

Amount of increase (decrease) of liabilities measured at fair value on a recurring basis using unobservable inputs (level 3) which have taken place during the period. Such increase (decrease) may be comprised of changes in fair value (gains or losses) whether realized or unrealized that have been included in earnings, changed net asset value, or other comprehensive income (a separate component of shareholders' equity); purchases, sales, issues, or settlements of assets; and net transfers in to or out of this category within the fair value hierarchy.

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