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Debt Debt (Details) - USD ($)
$ in Thousands
6 Months Ended
Sep. 30, 2020
Mar. 31, 2020
Debt Disclosure [Abstract]    
Schedule of Debt
Indebtedness was as follows:
 September 30,
2020
March 31,
2020
Credit Agreement$170,280 $275,449 
Private Placement 853,310 878,409 
Deferred financing costs(3,036)(3,337)
Total long term debt$1,020,554 $1,150,521 
 
Debt Instrument [Line Items]    
Private Placement $ 853,310 $ 878,409
Deferred financing costs 3,036 3,337
Credit Agreement 170,280 275,449
Total long term debt $ 1,020,554 $ 1,150,521