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Cash Flow Information - Supplemental - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
9 Months Ended 1 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Jan. 31, 2013
Subsequent Event
Cash Flow Supplemental Disclosures [Line Items]      
Cash payments made for interest $ 13.4 $ 17.9  
Net payments made for federal and state income taxes 11.3 2.1  
Non-cash investing activities 5.8    
Payment of non-cash investing activities     $ 5.8