Fair Value Measurements (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Mar. 31, 2019
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	$ 600,000	$ 600,000
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 Loans | 2012 Term B-5 Loans | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, senior notes and term loans	738,000	738,000
Revolving Credit Facility | 2012 ABL Revolver | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
2012 ABL Revolver	55,000	75,000
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	627,000	606,000
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	403,000	401,500
Fair Value, Measurements, Recurring | Term Loans | 2012 Term B-5 Loans | 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	733,388	728,775
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	$ 55,000	$ 75,000