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Share-Based Compensation - Schedule of Nonvested Restricted Stock Unit Activity (Detail) (Restricted Stock Units [Member])
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9 Months Ended |
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Mar. 31, 2015
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Restricted Stock Units [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Non-vested at June 30, 2014, Shares | 1,543,925 |
| Granted, Shares | 514,917 |
| Vested, Shares | (575,512) |
| Forfeited, Shares | (101,560) |
| Non-vested at March 31, 2015 | 1,381,770 |