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Stockholders' equity (Detail) - Stock options outstanding (USD $)
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Jul. 31, 2012
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Jul. 31, 2011
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Jul. 31, 2010
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|---|---|---|---|
| Shares | 736,490 | 785,124 | 1,132,450 |
| Weighted Average Exercise price (in Dollars per share) | $ 14.50 | $ 14.53 | $ 14.30 |
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Range of Exercise Prices 10.45 to 12.25 [Member]
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| Shares | 355,874 | ||
| Weighted-Average Remaining Contractual Life in years | 0.46 | ||
| Weighted Average Exercise price (in Dollars per share) | $ 11.82 | ||
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Range of Exercise Prices 12.99 to 17.66 [Member]
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| Shares | 380,616 | ||
| Weighted-Average Remaining Contractual Life in years | 1.94 | ||
| Weighted Average Exercise price (in Dollars per share) | $ 17.01 |
| X | ||||||||||
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- Definition
The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The weighted average period between the balance sheet date and expiration for all awards outstanding under the plan, which may be expressed in a decimal value for number of years. No definition available.
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