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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 6 Months Ended
Feb. 09, 2013
Feb. 09, 2013
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value - beginning of period      
Fair value of contingent consideration issued during the period (22,678) (22,678)
Change in fair value (327) (327)
Fair value - end of period $ (23,005) $ (23,005)