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Schedule of Share Based Compensation Shares Issued as Result of Executive Option under Various Plans (Parenthetical) (Detail)
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1 Months Ended | |
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Apr. 30, 2013
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Sep. 30, 2014
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Stock granted to employee | 2,289 | |
| Options Outstanding, Number of Shares | 8,061,491 | |
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Restricted stock units
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Options Outstanding, Number of Shares | 2,156,312 | |
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Market Performance Based Restricted Stock Units
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Options Outstanding, Number of Shares | 604,630 |