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Income Taxes - Summary of Changes to Unrecognized Tax Benefits Reserves Excluding Related Interest and Penalties (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2010
Income Tax Contingency [Line Items]      
Unrecognized tax benefits, beginning balance $ 9,013 $ 13,174 $ 7,765
Gross increase - tax positions in prior period 773 1,658  
Russell Hobbs acquired unrecognized tax benefits     3,251
HGI unrecognized tax benefits as of June 16, 2010     732
Gross decrease - tax positions in prior period (1,308) (823) (904)
Gross increase - tax positions in current period 776 596 3,390
Settlements (1,737) (1,850)  
Lapse of statutes of limitations (1,640) (3,742) (1,060)
Unrecognized tax benefits, ending balance $ 5,877 $ 9,013 $ 13,174