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Stock Option Plan and Employee Stock Purchase Plan (Tables)
 3 Months Ended
Oct. 31, 2012
Stock Option Plan and Employee Stock Purchase Plan [Abstract]  
Stock incentive plan
 
 
Number of
Shares Underlying
Stock-Based Awards
 
Weighted Average
Exercise Price
 
Weighted Average
Remaining Contractual
Term (Years)
 
Aggregate
Intrinsic Value
Outstanding at July 31, 2012
 
3,506,484

 
$
31.17

 
 
 
 
Granted
 
222

 
—

 
 
 
 
Expired/canceled
 
(542,075
)
 
40.95

 
 
 
 
Exercised
 
(16,200
)
 
19.95

 
 
 
 
Outstanding at October 31, 2012
 
2,948,431

 
$
29.44

 
4.92
 
$
3,852,000

 
 
 
 
 
 
 
 
 
Exercisable at October 31, 2012
 
1,704,942

 
$
30.90

 
2.58
 
$
2,652,000

 
 
 
 
 
 
 
 
 
Vested and expected to vest at October 31, 2012
 
2,881,798

 
$
29.47

 
4.84
 
$
3,808,000