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Status of the Plans (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Jul. 31, 2012
Y
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Opening Balance, shares 2,566
Granted, shares 1,252
Exercised, shares (2)
Forfeited or expired, shares (1,129)
Ending Balance, shares 2,687
Stock options exercisable ending balance, shares 1,289
Opening balance, weighted average exercise price $ 10.97
Granted, weighted average exercise price $ 4.26
Exercised, weighted average exercise price $ 3.78
Forfeited or expired, weighted average exercise price $ 10.11
Ending balance, weighted average exercise price $ 8.20
Stock options exercisable ending balance, weighted average exercise price $ 11.46
Ending balance, remaining contractual term 4.30
Stock options exercisable ending balance, remaining contractual term 2.61
Stock options outstanding, ending balance $ 5
Stock options exercisable, ending balance $ 5