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Debt (Narrative - Senior Notes) (Details)
$ in Millions
6 Months Ended
Sep. 30, 2019
USD ($)
Debt Instrument [Line Items]  
Basis spread on treasury rate 0.50%
5.875% Senior Notes | Senior Notes  
Debt Instrument [Line Items]  
Coupon rate 5.875%
Debt instrument redemption premium percentage, as a percentage of principal amount prepaid or redeemed 1.00%
6.375% Senior Notes | Senior Notes  
Debt Instrument [Line Items]  
Coupon rate 6.375%
Debt instrument redemption premium percentage, as a percentage of principal amount prepaid or redeemed 1.00%
Senior Credit Facilities And 5.875% Senior Notes And 6.375% Senior Notes  
Debt Instrument [Line Items]  
Net loss, amount free of restrictions $ 59.7
Retained earnings, amount free of restrictions $ 143.7
Debt instrument, redemption period one | 5.875% Senior Notes | Senior Notes  
Debt Instrument [Line Items]  
Debt instrument redemption price percentage 100.00%
Debt instrument, redemption period one | 6.375% Senior Notes | Senior Notes  
Debt Instrument [Line Items]  
Debt instrument redemption price percentage 100.00%
Debt instrument, redemption, period two | 5.875% Senior Notes | Senior Notes  
Debt Instrument [Line Items]  
Debt instrument redemption price percentage 104.406%
Debt instrument, redemption, period two | 6.375% Senior Notes | Senior Notes  
Debt Instrument [Line Items]  
Debt instrument redemption price percentage 103.188%
Debt instrument, redemption, period three | 5.875% Senior Notes | Senior Notes  
Debt Instrument [Line Items]  
Debt instrument redemption price percentage 102.938%
Debt instrument, redemption, period three | 6.375% Senior Notes | Senior Notes  
Debt Instrument [Line Items]  
Debt instrument redemption price percentage 101.594%
Debt instrument, redemption, period four | 5.875% Senior Notes | Senior Notes  
Debt Instrument [Line Items]  
Debt instrument redemption price percentage 101.439%
Debt instrument, redemption, period four | 6.375% Senior Notes | Senior Notes  
Debt Instrument [Line Items]  
Debt instrument redemption price percentage 100.00%
Debt instrument, redemption, period five | 5.875% Senior Notes | Senior Notes  
Debt Instrument [Line Items]  
Debt instrument redemption price percentage 100.00%
Change in Control | 5.875% Senior Notes and 6.375% Senior Notes | Senior Notes  
Debt Instrument [Line Items]  
Debt instrument redemption price percentage 101.00%
Certain Asset Disposition | 5.875% Senior Notes and 6.375% Senior Notes | Senior Notes  
Debt Instrument [Line Items]  
Debt instrument redemption price percentage 100.00%