CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Mar. 31, 2018	Sep. 30, 2017
Statement of Financial Position [Abstract]
Short-term Debt	$ 70.3	$ 161.4
Long Term Debt Current And Non Current	5,318.7	5,705.1
Liabilities, Current	1,222.5	27,645.0
Investments ():
Cash and cash equivalents	758.8	270.1
Other receivables, net	337.6	266.0
Other Receivables, Net, Current	62.2	19.7
Inventories, net	610.5	496.3
Property, plant and equipment, net	504.5	503.9
Goodwill	2,280.2	2,277.1
Intangibles, net	1,589.5	1,612.0
Deferred charges and other assets	60.8	43.7
Disposal Group, Including Discontinued Operation, Assets, Noncurrent	0.0	1,376.9
Assets, Current	3,805.3	30,036.1
Prepaid Expense and Other Assets	60.2	54.8
Disposal Group, Including Discontinued Operation, Assets, Current	1,976.0	28,929.2
Total assets	8,240.3	35,849.7
Long-term Debt, Excluding Current Maturities	5,248.4	5,543.7
Insurance reserves:
Other Accrued Liabilities, Current	129.0	125.8
Employee benefit obligations	38.8	38.6
Deferred tax liabilities	285.8	493.2
Other long-term liabilities	101.1	26.2
Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent	0.0	156.1
Disposal Group, Including Discontinued Operation, Liabilities, Current	558.6	26,851.3
Total liabilities	6,896.6	33,902.8
Commitments and contingencies
Temporary equity (Note 0) :
Common stock	2.1	2.0
Additional paid-in capital	1,270.4	1,372.9
Accumulated deficit	(455.6)	(925.9)
Accumulated other comprehensive (loss) income	(125.3)	309.0
Total HRG Group, Inc. shareholders' equity	691.6	758.0
Noncontrolling interest	652.1	1,188.9
Total shareholders' equity	1,343.7	1,946.9
Total liabilities and equity	8,240.3	35,849.7
Accounts Payable and Accrued Liabilities, Current	360.7	373.1
Accrued Wages And Related Expenses	41.3	55.4
Interest Payable, Current	$ 62.6	$ 78.0