Stock-Based Compensation - 2016 Plan (Details)
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12 Months Ended |
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Jul. 31, 2018
Installment
shares
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Jul. 31, 2017
shares
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Jul. 31, 2016
shares
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Jan. 31, 2016
shares
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Jul. 31, 2015
shares
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Outstanding unvested restricted stock shares |
212,106,000
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222,298,000
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331,367,000
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|
343,519,000
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| Stock options |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Outstanding options (in shares) |
70,000
|
122,500
|
122,500
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| 2016 Plan |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Maximum number of shares authorized for issuance |
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1,200,000
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| Number of anniversaries of grant date on which awards vest | Installment |
3
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| Outstanding unvested restricted stock shares |
179,133
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| Outstanding options (in shares) |
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0
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| Shares available under Plan |
974,659
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| 2016 Plan | First anniversary vesting |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Vesting percentage |
33.33%
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| Vesting period |
1 year
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| 2016 Plan | Second anniversary vesting |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Vesting percentage |
33.33%
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| Vesting period |
2 years
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| 2016 Plan | Third anniversary vesting |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
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| Vesting percentage |
33.33%
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|
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| Vesting period |
3 years
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