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Subsequent Events (Details) - USD ($) |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 25, 2018 | Oct. 03, 2018 | Sep. 30, 2016 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Subsequent Event [Line Items] |  |  |  |  |  |
Granted (in shares) |  |  | 0 | 300,000 | 750,000 | 0
Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
New shares issued (in shares) |  | 752,234 |  |  |  |
Shares issued (in dollars per share) |  | $ 34 |  |  |  |
Amount of stock issued during period |  | $ 25,575,956 |  |  |  |
Period following an executive's termination of employment for a number of reasons | 18 months |  |  |  |  |
Period following an executive's termination of employment without cause | 12 months |  |  |  |  |
Tranche One | Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Options vesting (in shares) | 3,333 |  |  |  |  |
Period of consecutive trading days | 20 days |  |  |  |  |
Sale of stock (in dollars per share) | $ 40.00 |  |  |  |  |
Tranche Two | Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Options vesting (in shares) | 3,333 |  |  |  |  |
Period of consecutive trading days | 20 days |  |  |  |  |
Sale of stock (in dollars per share) | $ 45.00 |  |  |  |  |
Tranche Three | Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Options vesting (in shares) | 3,334 |  |  |  |  |
Period of consecutive trading days | 20 days |  |  |  |  |
Sale of stock (in dollars per share) | $ 50.00 |  |  |  |  |
Chief Financial Officer | Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Shares issued (in dollars per share) | $ 33.34 |  |  |  |  |
Granted (in shares) | 10,000 |  |  |  |  |

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