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Fair Value Measurements (Summary of Carrying Amounts and Estimated Fair Values) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Mar. 31, 2016
Senior Notes | 2016 Senior Notes | Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, senior notes and term loans $ 350,000 $ 350,000
Senior Notes | 2013 Senior Notes | Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, senior notes and term loans 400,000 400,000
Term B-3 Loans | 2012 Term Loan | Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, senior notes and term loans 687,000 817,500
Revolving Credit Facility | 2012 ABL Revolver | Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
2012 ABL Revolver 0 85,000
Fair Value, Measurements, Recurring | Senior Notes | 2016 Senior Notes | Fair Value | Fair Value, Inputs, Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, senior notes and term loans 367,500 363,125
Fair Value, Measurements, Recurring | Senior Notes | 2013 Senior Notes | Fair Value | Fair Value, Inputs, Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, senior notes and term loans 413,000 408,000
Fair Value, Measurements, Recurring | Term B-3 Loans | 2012 Term Loan | Fair Value | Fair Value, Inputs, Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, senior notes and term loans 692,153 818,522
Fair Value, Measurements, Recurring | Revolving Credit Facility | 2012 ABL Revolver | Fair Value | Fair Value, Inputs, Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
2012 ABL Revolver $ 0 $ 85,000