Notes Payable - Schedule of Notes Payable (Detail) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2013	Jul. 31, 2012
Debt Instrument [Line Items]
Notes payable	$ 7,159	$ 30,276
Less current portion	(535)	(560)
Notes payable-long term portion	6,624	29,716
Notes Due June 2012 [Member]
Debt Instrument [Line Items]
Notes payable	279	279
Secured Term Loan Due April 2020 [Member]
Debt Instrument [Line Items]
Secured term loan		22,876
Secured Term Loan Due September 2015 [Member]
Debt Instrument [Line Items]
Secured term loan	$ 6,880	$ 7,121

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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