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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Mar. 31, 2018
Carrying value | Senior Notes | 2016 Senior Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt, fair value $ 600,000 $ 600,000
Carrying value | Senior Notes | 2013 Senior Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt, fair value 400,000 400,000
Carrying value | Term Loans | 2012 Term B-5 Loans    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt, fair value 738,000 938,000
Carrying value | Revolving Credit Facility | 2012 ABL Revolver    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt, fair value 75,000 75,000
Fair value | Fair Value, Inputs, Level 2 | Senior Notes | 2016 Senior Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt, fair value 606,000 610,500
Fair value | Fair Value, Inputs, Level 2 | Senior Notes | 2013 Senior Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt, fair value 401,500 402,000
Fair value | Fair Value, Inputs, Level 2 | Term Loans | 2012 Term B-5 Loans    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt, fair value 728,775 939,173
Fair value | Fair Value, Inputs, Level 2 | Revolving Credit Facility | 2012 ABL Revolver    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt, fair value $ 75,000 $ 75,000