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Long-Term Debt (Narrative Redemptions and Restrictions) (Details) - USD ($)
$ in Thousands
12 Months Ended
Feb. 19, 2016
Mar. 31, 2017
Mar. 31, 2016
Debt Instrument [Line Items]      
Less unamortized debt costs   $ 28,268 $ 27,191
Senior Notes | 2012 Senior Notes      
Debt Instrument [Line Items]      
Debt instrument, redemption price, percentage of principal amount 104.063%    
Senior Notes | 2013 Senior Notes      
Debt Instrument [Line Items]      
Debt instrument, redemption price, percentage of principal amount   101.00%  
Less unamortized debt costs   $ 4,900 5,400
Senior Notes | 2016 Senior Notes      
Debt Instrument [Line Items]      
Less unamortized debt costs   4,600 5,400
Term Loans | 2012 Term Loan      
Debt Instrument [Line Items]      
Less unamortized debt costs   18,800 16,400
Revolving Credit Facility | 2012 ABL Revolver      
Debt Instrument [Line Items]      
Less unamortized debt costs   1,300 1,300
Repayments of long-term debt   90,000  
Revolving credit facility, remaining borrowing capacity   $ 82,600  
Other long-term assets | New Accounting Pronouncement, Early Adoption, Effect      
Debt Instrument [Line Items]      
Deferred finance costs, net     (27,400)
Long-term debt | New Accounting Pronouncement, Early Adoption, Effect      
Debt Instrument [Line Items]      
Deferred finance costs, net     $ 27,400
Prior to December 15, 2016 | Senior Notes | 2013 Senior Notes      
Debt Instrument [Line Items]      
Debt instrument, redemption price, percentage of principal amount   100.00%  
Debt instrument, redemption price, percentage of principal amount, using proceeds of equity offerings   105.375%  
Prior to March 1, 2019 | Senior Notes | 2016 Senior Notes      
Debt Instrument [Line Items]      
Debt instrument, redemption price, percentage of principal amount 100.00%    
Maximum | Prior to December 15, 2016 | Senior Notes | 2013 Senior Notes      
Debt Instrument [Line Items]      
Debt instrument, percentage of principal amount which can be redeemed   35.00%  
Maximum | Prior to March 1, 2019 | Senior Notes | 2016 Senior Notes      
Debt Instrument [Line Items]      
Debt instrument, percentage of principal amount which can be redeemed 40.00%    
Indirect guarantee of indebtedness | Senior Notes | 2016 Senior Notes      
Debt Instrument [Line Items]      
Debt instrument, redemption price, percentage of principal amount 101.00%