Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2013
Income Taxes [Line Items]
Effective income tax rate	48.60%	104.40%
Statutory rate	35.00%
Increase Decrease In Fair Value Of Equity Conversion Feature Of Preferred Stock	$ 47.2	$ (68.9)
Unrecognized tax benefits	13.3		13.8
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	9.6		10.1
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	178.7
Uncertain tax positions [Member]
Income Taxes [Line Items]
Accrued interest and penalties related to the uncertain tax positions	3.6		3.7
Spectrum Brands [Member] | U S Federal [Member]
Income Taxes [Line Items]
Increase In Valuation Allowance Due To Acquisition		$ (45.9)