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Stock-based Compensation - Summary of Stock Options Outstanding and Related Activity (Detail) - Employee Stock Option - HGI shares in Thousands | 6 Months Ended
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Mar. 31, 2018 $ / shares shares
Options (in shares): |
Stock options outstanding at September 30, 2017 | shares | 3,976
Granted | shares | 0
Exercised | shares | (1,565)
Stock options outstanding at March 31, 2018 | shares | 2,411
Stock options vested and exercisable at March 31, 2018 | shares | 2,154
Stock options outstanding and expected to vest | shares | 2,411
Weighted Average Exercise Price (in dollars per share): |
Stock options outstanding at September 30, 2017 | $ 9.69
Exercised | 6.45
Stock options outstanding at March 31, 2018 | 11.79
Stock options vested and exercisable at March 31, 2018 | 11.36
Stock options outstanding and expected to vest | 11.79
Weighted Average Grant Date Fair Value (in dollars per share): |
Stock options outstanding at September 30, 2017 | 3.88
Granted | 0.00
Exercised | 2.48
Stock options outstanding at March 31, 2018 | 4.78
Stock options vested and exercisable at March 31, 2018 | 4.64
Stock options outstanding and expected to vest | $ 4.78

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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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