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Restructuring Charges - Restructuring Charges (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2009
Restructuring Cost and Reserve [Line Items]
Additions		$ 339
Adjustment to restructuring reserve from reversed balance of a reserve for the consolidation	(227)
Payments	67	543
Accrual Balance, Ending		294	498
Accrual Balance, Beginning	294	294	498
Workforce Reductions [Member]
Restructuring Cost and Reserve [Line Items]
Additions		339
Payments	67	272
Accrual Balance, Ending		67
Accrual Balance, Beginning	67	67
Facility Demolition And Relocation Costs [Member]
Restructuring Cost and Reserve [Line Items]
Adjustment to restructuring reserve from reversed balance of a reserve for the consolidation	(227)
Payments		271
Accrual Balance, Ending		227	498
Accrual Balance, Beginning	$ 227	$ 227	$ 498

Amount of any reversal and other adjustment made during the period to the amount of a previously accrued liability for a specified type of restructuring cost, excluding adjustments for costs incurred during the period, costs settled during the period, and foreign currency translation adjustments.

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- Definition

Amount of cash paid in the period to fully or partially settle a specified, previously accrued type of restructuring cost.

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