Other Current Liabilities - Additional Information (Detail) - USD ($) $ in Thousands	Jan. 31, 2017	Jul. 31, 2016
Accrued Expenses and Other Current Liabilities [Line Items]
Accrued pricing liabilities	$ 18,882	$ 18,882

Accrued Expenses and Other Current Liabilities [Line Items]

No definition available.

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration