Net Interest Expense (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Oct. 31, 2014	Oct. 31, 2013
Schedule Of Interest Expenses [Line Items]
Capitalized interest	$ (190)	$ (14)
Other	220	239
Amortization of deferred financing costs and debt discounts	1,452	1,724
Net interest expense	10,236	14,848
Senior Note
Schedule Of Interest Expenses [Line Items]
Interest expense debt	3,976	0
Senior Note | Oaktree Capital Management, L.P.
Schedule Of Interest Expenses [Line Items]
Interest expense debt	0	6,953
Secured Credit Facility
Schedule Of Interest Expenses [Line Items]
Interest expense debt	0	5,818
Guaranteed Loan
Schedule Of Interest Expenses [Line Items]
Interest expense debt	101	128
ABL Facility
Schedule Of Interest Expenses [Line Items]
Interest expense debt	150	0
Term Loan Facility
Schedule Of Interest Expenses [Line Items]
Interest expense debt	$ 4,527	$ 0