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Debt Arrangements - Summary (Details) - USD ($)
9 Months Ended
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]      
Total debt $ 1,483,132,000 $ 1,327,679,000  
Short-term 580,346,000 428,961,000  
Current portion of long-term debt 325,000 332,000 $ 165,000
Long-term debt 902,461,000 898,386,000 $ 897,195,000
Long-term debt including current maturities 902,786,000 898,718,000  
Letters of credit outstanding 7,151,000 5,399,000  
Lines and Letters Available      
Lines of credit available 318,436,000    
Letters of credit available 5,740,000    
Total credit available 324,176,000    
Interest Rate      
Maximum unrestricted cash and cash equivalents 180,000,000    
Credit Facility | Credit Facility      
Debt Instrument [Line Items]      
Total debt 0 0  
Lines and Letters Available      
Lines of credit available $ 60,000,000    
Interest Rate      
Interest rate (as a percent) 0.00%    
Senior Notes | Senior Secured First Lien Notes Due 2021      
Debt Instrument [Line Items]      
Total debt $ 272,369,000 270,883,000  
Lines and Letters Available      
Lines of credit available $ 0    
Interest Rate      
Interest rate (as a percent) 8.50%    
Original issue discount $ 826,000    
Unamortized debt issuance costs 1,805,000    
Repayments of debt 275,000,000    
Senior Notes | Senior Secured Second Lien Notes Due 2021      
Debt Instrument [Line Items]      
Total debt 629,821,000 627,147,000  
Lines and Letters Available      
Lines of credit available $ 0    
Interest Rate      
Interest rate (as a percent) 9.875%    
Original issue discount $ 3,328,000    
Unamortized debt issuance costs 2,537,000    
Repayments of debt 635,686,000    
Other long-term debt      
Debt Instrument [Line Items]      
Total debt 596,000 688,000  
Lines and Letters Available      
Lines of credit available $ 0    
Interest Rate      
Weighted-average interest rate (as a percent) 5.20%    
Notes payable to banks      
Debt Instrument [Line Items]      
Total debt $ 580,346,000 $ 428,961,000  
Lines and Letters Available      
Lines of credit available $ 258,436,000    
Interest Rate      
Weighted-average interest rate (as a percent) 7.10%