Long-Term Debt (Schedule of Long-term Debt) (Details) (USD $)	Jun. 30, 2014	Mar. 31, 2014
Debt Instrument [Line Items]
Long-term debt, gross	$ 972,500,000	$ 937,500,000
Current portion of long-term debt	0	0
Principal amount	972,500,000	937,500,000
Less: unamortized discount	(2,942,000)	(3,086,000)
Long-term debt, net of unamortized discount	969,558,000	934,414,000
Revolving Credit Facility | 2012 ABL Revolver
Debt Instrument [Line Items]
Long-term debt, gross	35,000,000	0
Senior Notes | 2013 Senior Notes
Debt Instrument [Line Items]
Long-term debt, gross	400,000,000	400,000,000
Senior Notes | 2012 Senior Notes
Debt Instrument [Line Items]
Long-term debt, gross	250,000,000	250,000,000
Term Loans | 2012 Term Loan
Debt Instrument [Line Items]
Long-term debt, gross	$ 287,500,000	$ 287,500,000