Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 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	$ 0	$ 0	$ (360)	$ 0
Actuarial gain, net of taxes ($3,110)	0	0	5,306	0
Net Income (Loss) Attributable to Parent	61,612	67,446	124,343	195,690
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Foreign currency translation adjustment	(15,658)	(16,827)	(4,725)	(9,623)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	487	0	1,421	0
Other Comprehensive Income (Loss), Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service (Cost) Credit, Net of Tax	(1,584)	(1,533)	(1,348)	(3,066)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax, Portion Attributable to Parent	(1,097)	(1,533)	5,739	(3,066)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(1,766)	906	(754)	(451)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	(34)	(31)	(27)	(66)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	(1,800)	875	(781)	(517)
Other Comprehensive Income (Loss), Net of Tax	(18,555)	(17,485)	233	(13,206)
Total comprehensive income	$ 43,057	$ 49,961	$ 124,576	$ 182,484