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Stockholders' Equity and Noncontrolling Interests - (Reclassifications from AOCI) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net unrealized gain on derivative instruments $ (564,820) $ (499,582) $ (1,143,538) $ (1,004,652)
Derivatives in cash flow hedging relationships        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Tax expense (benefit) 736 (777) 580 (827)
Net of tax (2,374) 2,531 (1,872) 2,695
Derivatives in cash flow hedging relationships | Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net unrealized gain on derivative instruments (3,110) 3,308 (2,452) 3,522
Defined benefit pension costs        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Prior service costs and deferrals 296 340 601 708
Tax expense (benefit) (59) (40) (127) (108)
Net of tax $ 237 $ 300 $ 474 $ 600