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Share-Based Payments - Restricted Stock Units (Details) - Restricted Stock Units
$ / shares in Units, shares in Thousands
12 Months Ended
Sep. 30, 2019
USD ($)
$ / shares
shares
Restricted stock (in shares)  
Granted (in shares) | shares 88
Vested (in shares) | shares (80)
Forfeited (in shares) | shares (8)
Restricted Stock (in dollars per share)  
Granted (in dollars per share) | $ / shares $ 18.14
Vested (in dollar per share) | $ / shares 18.14
Forfeited (in dollars per share) | $ / shares $ 18.14
Total unrecognized compensation expenses related to unvested awards | $ $ 0