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Stock Compensation - Summary of Stock Options Outstanding and Related Activity (Detail) - HGI [Member] - $ / shares shares in Thousands	3 Months Ended	9 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Sep. 30, 2015
Warrant [Member]
Options (in shares):
Stock options outstanding at September 30, 2015		1,800
Stock options outstanding at June 30, 2016		1,800		1,800
Stock options vested and exercisable at June 30, 2016		600
Weighted Average Exercise Price (in dollars per share):
Granted		$ 13.13		$ 13.13
Stock options vested and exercisable at June 30, 2016		13.13
Weighted Average Grant Date Fair Value (in dollars per share):
Granted		3.22		$ 3.22
Stock options vested and exercisable at June 30, 2016		$ 3.22
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number		1,200
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price		$ 13.13
Restricted award expected to vest		$ 3.22
Employee Stock Option [Member]
Options (in shares):
Stock options outstanding at September 30, 2015		4,770
Granted	78	28	900
Exercised		(497)
Stock options outstanding at June 30, 2016		4,301		4,770
Stock options vested and exercisable at June 30, 2016		3,266
Weighted Average Exercise Price (in dollars per share):
Granted		$ 13.93
Exercised		8.25
Stock options outstanding at June 30, 2016		9.40		$ 9.25
Stock options vested and exercisable at June 30, 2016		8.39
Weighted Average Grant Date Fair Value (in dollars per share):
Granted		5.07
Exercised		3.24
Stock options outstanding at June 30, 2016		3.77		$ 3.70
Stock options vested and exercisable at June 30, 2016		$ 3.36
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number		4,301
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price		$ 9.40
Restricted award expected to vest		$ 3.77

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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