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Stock Compensation - Summary of Stock Options Outstanding and Related Activity (Detail) - HGI [Member] - $ / shares shares in Thousands | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Sep. 30, 2016 | Jun. 30, 2016
Warrant [Member] |  |  |
Options (in shares): |  |  |
Stock options outstanding at September 30, 2016 | 1,200 |  |
Stock options outstanding at June 30, 2017 | 600 | 1,200 |
Weighted Average Exercise Price (in dollars per share): |  |  |
Granted | $ 13.13 | $ 13.13 |
Exercised | 13.13 |  |
Weighted Average Grant Date Fair Value (in dollars per share): |  |  |
Granted | $ 3.22 | $ 3.22 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number | 600 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price | $ 13.13 |  | $ 13.125
Restricted award expected to vest | $ 3.22 |  |
Employee Stock Option [Member] |  |  |
Options (in shares): |  |  |
Stock options outstanding at September 30, 2016 | 4,231 |  |
Granted | 318 |  |
Exercised | (496) |  |
Stock options outstanding at June 30, 2017 | 4,053 | 4,231 |
Stock options vested and exercisable at June 30, 2017 | 3,618 |  |
Weighted Average Exercise Price (in dollars per share): |  |  |
Granted | $ 15.39 |  |
Exercised | 11.12 |  |
Stock options outstanding at June 30, 2017 | 9.74 | $ 9.48 |
Stock options vested and exercisable at June 30, 2017 | 9.15 |  |
Weighted Average Grant Date Fair Value (in dollars per share): |  |  |
Granted | 5.96 |  |
Exercised | 4.46 |  |
Stock options outstanding at June 30, 2017 | 3.89 | $ 3.80 |
Stock options vested and exercisable at June 30, 2017 | $ 3.68 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number | 4,053 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price | $ 9.74 |  |
Restricted award expected to vest | $ 3.89 |  |

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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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- Definition As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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