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Stock-based Compensation - Summary of Stock Options Outstanding and Related Activity (Detail) - Employee Stock Option - HGI shares in Thousands | 12 Months Ended
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Sep. 30, 2017 $ / shares shares
Options (in shares): |
Stock options outstanding at September 30, 2016 | shares | 4,231
Granted | shares | 318
Exercised | shares | (573)
Stock options outstanding at September 30, 2017 | shares | 3,976
Stock options vested and exercisable at September 30, 2017 | shares | 3,580
Stock options outstanding and expected to vest | shares | 3,976
Weighted Average Exercise Price (in dollars per share): |
Stock options outstanding at September 30, 2016 | $ 9.48
Granted | 15.39
Exercised | 11.28
Stock options outstanding at September 30, 2017 | 9.69
Stock options vested and exercisable at September 30, 2017 | 9.12
Stock options outstanding and expected to vest | 9.69
Weighted Average Grant Date Fair Value (in dollars per share): |
Stock options outstanding at September 30, 2016 | 3.80
Granted | 5.96
Exercised | 4.48
Stock options outstanding at September 30, 2017 | 3.88
Stock options vested and exercisable at September 30, 2017 | 3.67
Stock options outstanding and expected to vest | $ 3.88

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