Consolidated Statements of Comprehensive Income Parenthetical (Parentheticals) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Prior service credit, net of taxes of $0 and ($7,023) for the three months ended and $0 and ($7,023) for the nine months ended	$ 7,944	$ 0	$ (8,305)	$ 0
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit), Tax	(4,657)	0	(4,868)	0
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During the Period, Tax	0	0	(1,875)	$ 0
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net (Gain) Loss, Tax	(244)	0	1,077
Other Comprehensive Income (Loss), Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service (Cost) Credit, Tax	1,084	921	1,719
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During the Period, Tax	(1,278)	1,079	(795)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	$ 9	$ (7)	$ 7