Acquisitions - Schedule of Preliminary purchase price (Detail) (USD $) In Millions, unless otherwise specified	Dec. 17, 2012 HHI Business [Member]	Nov. 08, 2012 Shaser Biosciences, Inc. [Member]
Business Acquisition [Line Items]
Negotiated sales price	$ 1,300.0	$ 50.0
Preliminary working capital and other adjustments	(10.6)	(0.4)
Preliminary purchase price	$ 1,289.4	$ 49.6

Business Acquisition Cost Of Acquired Entity Preliminary Purchase Price

No definition available.

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Namespace Prefix:	hrg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant