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Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Statement of Comprehensive Income [Abstract]        
Net income $ 69,773 $ 55,590 $ 220,226 $ 186,237
Unrealized gain on derivatives designated as cash flow hedges 2,052 0 1,418 0
Change in postretirement plan costs 363 481 1,087 1,395
Total other comprehensive income, net of tax 2,415 481 2,505 1,395
Comprehensive income $ 72,188 $ 56,071 $ 222,731 $ 187,632