Stock Compensation - Summary of Stock Options Outstanding and Related Activity (Detail) (Stock option awards [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended
	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
HGI [Member]
Options (in shares):
Stock options outstanding at September 30, 2013		3,954
Granted	30	1,326	1,528
Exercised		(497)
Forfeited or expired		(25)
Stock options outstanding at March 31, 2014		4,758
Stock options vested and exercisable at March 31, 2014		1,379
Stock options outstanding and expected to vest		3,379
Weighted Average Exercise Price (in dollars per share):
Stock options outstanding at September 30, 2013		$ 6.52
Granted		$ 11.76
Exercised		$ 4.96
Forfeited or expired		$ 7.67
Stock options outstanding at March 31, 2014		$ 8.14
Stock options vested and exercisable at March 31, 2014		$ 7.39
Stock options outstanding and expected to vest		$ 8.45
Weighted Average Grant Date Fair Value (in dollars per share):
Stock options outstanding at September 30, 2013		$ 2.55
Granted		$ 4.91
Exercised		$ 1.77
Forfeited or expired		$ 2.98
Stock options outstanding at March 31, 2014		$ 3.28
Stock options vested and exercisable at March 31, 2014		$ 2.93
Stock options outstanding and expected to vest		$ 3.43
FGL [Member]
Options (in shares):
Stock options outstanding at September 30, 2013		335
Granted		0
Exercised		(28)
Forfeited or expired		(3)
Stock options outstanding at March 31, 2014		304
Stock options vested and exercisable at March 31, 2014		129
Stock options outstanding and expected to vest		168
Weighted Average Exercise Price (in dollars per share):
Stock options outstanding at September 30, 2013		$ 44.23
Granted		$ 0.00
Exercised		$ 41.79
Forfeited or expired		$ 46.43
Stock options outstanding at March 31, 2014		$ 44.43
Stock options vested and exercisable at March 31, 2014		$ 42.56
Stock options outstanding and expected to vest		$ 44.37
FGL [Member]
Options (in shares):
Stock options outstanding at September 30, 2013		0
Granted		249
Exercised		0
Forfeited or expired		(2)
Stock options outstanding at March 31, 2014		247
Stock options vested and exercisable at March 31, 2014		0
Stock options outstanding and expected to vest		242
Weighted Average Exercise Price (in dollars per share):
Stock options outstanding at September 30, 2013		$ 0.00
Granted		$ 17.00
Exercised		$ 0.00
Forfeited or expired		$ 17.00
Stock options outstanding at March 31, 2014		$ 17.00
Stock options vested and exercisable at March 31, 2014		$ 0.00
Stock options outstanding and expected to vest		$ 17.00
Weighted Average Grant Date Fair Value (in dollars per share):
Stock options outstanding at September 30, 2013		$ 0.00
Granted		$ 3.76
Exercised		$ 0.00
Forfeited or expired		$ 5.26
Stock options outstanding at March 31, 2014		$ 3.74
Stock options vested and exercisable at March 31, 2014		$ 0.00
Stock options outstanding and expected to vest		$ 3.71