Stock Compensation - Assumptions Used in Determination of Grant Date Fair Values Using Black-Scholes Option Pricing Model (Detail)	12 Months Ended			6 Months Ended	12 Months Ended		6 Months Ended		12 Months Ended												6 Months Ended		12 Months Ended	6 Months Ended
	Sep. 30, 2013 FGLH	Sep. 30, 2012 FGLH	Sep. 30, 2012 HGI Minimum	Mar. 31, 2014 FGL Minimum	Sep. 30, 2014 FGL Minimum	Sep. 30, 2013 FGL Minimum	Mar. 31, 2014 FGL Maximum	Mar. 31, 2013 FGL Maximum	Sep. 30, 2012 FGLH [Member] Minimum	Sep. 30, 2014 Employee Stock Option HGI	Sep. 30, 2013 Employee Stock Option HGI	Sep. 30, 2012 Employee Stock Option HGI	Sep. 30, 2014 Employee Stock Option HGI Minimum	Sep. 30, 2013 Employee Stock Option HGI Minimum	Sep. 30, 2012 Employee Stock Option HGI Minimum	Sep. 30, 2014 Employee Stock Option HGI Maximum	Sep. 30, 2013 Employee Stock Option HGI Maximum	Sep. 30, 2012 Employee Stock Option HGI Maximum	Sep. 30, 2014 Employee Stock Option FGL Minimum	Sep. 30, 2013 Employee Stock Option FGL Minimum	Mar. 31, 2014 Employee Stock Option FGL Maximum	Mar. 31, 2013 Employee Stock Option FGL Maximum	Sep. 30, 2012 Employee Stock Option FGLH [Member] Minimum	Mar. 31, 2012 Employee Stock Option FGLH [Member] Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate													1.365%	0.84%	0.97%	1.703%	1.86%	1.19%	1.40%	0.80%	1.41%		0.80%
Assumed dividend yield	6.00%	10.00%		1.00%			1.50%			0.00%	0.00%	0.00%
Expected option term			6 years 0 months 0 days		4 years 6 months	4 years 6 months			4 years 6 months				5 years 0 months 0 days	5 years 3 months 18 days		5 years 10 months 24 days	6 years 2 months 12 days
Volatility													37.76%	41.90%	33.00%	39.75%	44.00%	35.50%	25.00%	27.00%			35.00%