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Income Taxes - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Dec. 30, 2012
Jan. 01, 2012
Sep. 30, 2012
Income Taxes [Line Items]      
Effective tax rate 48.60% 46.50%  
Statutory rate 35.00%    
Valuation allowances on deferred tax assets $ 45.9 $ 13.9  
Percentage of ownership change 50.00%    
Time period over percentage change of ownership occur 3 years    
Unrecognized tax benefits 5.5   5.9
Uncertain tax positions [Member]
     
Income Taxes [Line Items]      
Accrued interest and penalties related to the uncertain tax positions $ 3.4   $ 3.6