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Other Current Liabilities - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2015	Jul. 31, 2014
Other Liabilities [Line Items]
Accrued pricing liabilities	$ 18,882us-gaap_OtherAccruedLiabilitiesCurrent	$ 19,301us-gaap_OtherAccruedLiabilitiesCurrent

Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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