Other Comprehensive Income (Loss) Component of Accumulated Other Comprehensive Loss, Net of Tax (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Sep. 30, 2015	Jun. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive income (loss), net of tax, beginning balance	$ (55,661)	$ (53,848)	$ (62,854)	$ (66,386)	$ (53,848)	$ (66,386)
Other comprehensive loss before reclassifications	(585)	(2,274)	2,797	2,532
Amounts reclassified to net earnings, net of tax	460	461	1,000	1,000
Total other comprehensive income (loss), net of tax	(125)	(1,813)	3,797	3,532	(1,938)	7,329
Accumulated other comprehensive income (loss), net of tax, ending balance	(55,786)	(55,661)	(59,057)	(62,854)	(55,786)	(59,057)
Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive income (loss), net of tax, beginning balance	(16,320)	(14,046)	(11,847)	(14,154)	(14,046)	(14,154)
Other comprehensive loss before reclassifications	(585)	(2,274)	(1,664)	2,307
Amounts reclassified to net earnings, net of tax	0	0	0	0
Total other comprehensive income (loss), net of tax	(585)	(2,274)	(1,664)	2,307	(2,859)	643
Accumulated other comprehensive income (loss), net of tax, ending balance	(16,905)	(16,320)	(13,511)	(11,847)	(16,905)	(13,511)
Pensions, Net of Tax
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive income (loss), net of tax, beginning balance	(39,341)	(39,802)	(51,007)	(52,232)	(39,802)	(52,232)
Other comprehensive loss before reclassifications	0	0	4,461	225
Amounts reclassified to net earnings, net of tax	460	461	1,000	1,000
Total other comprehensive income (loss), net of tax	460	461	5,461	1,225	921	6,686
Accumulated other comprehensive income (loss), net of tax, ending balance	$ (38,881)	$ (39,341)	$ (45,546)	$ (51,007)	$ (38,881)	$ (45,546)