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Fair Value Measurements (Summary of Carrying Amounts and Estimated Fair Values) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Mar. 31, 2018
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 | Term B-4 Loans | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, senior notes and term loans	838,000	938,000
Revolving Credit Facility | 2012 ABL Revolver | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
2012 ABL Revolver	75,000	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	606,000	610,500
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	400,000	402,000
Fair Value, Measurements, Recurring | Term Loans | Term B-4 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	838,000	939,173
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	$ 75,000	$ 75,000

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Fair value portion of contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time.

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- Definition

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