Other Comprehensive Income (Loss) Component of Accumulated Other Comprehensive Loss, Net of Tax (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive income (loss), net of tax, beginning balance	$ (55,786)	$ (59,057)	$ (53,848)	$ (66,386)	$ (53,848)	$ (66,386)
Other comprehensive loss before reclassifications	(4,529)	1,459	(2,859)	5,329
Amounts reclassified to net earnings, net of tax	1,581	1,787	921	2,000
Total other comprehensive income (loss), net of tax	(2,948)	3,246	(1,938)	7,329	(4,886)	10,575
Accumulated other comprehensive income (loss), net of tax, ending balance	(58,734)	(55,811)	(55,786)	(59,057)	(58,734)	(55,811)
Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive income (loss), net of tax, beginning balance	(16,905)	(13,511)	(14,046)	(14,154)	(14,046)	(14,154)
Other comprehensive loss before reclassifications	(4,529)	(1,075)	(2,859)	643
Amounts reclassified to net earnings, net of tax	0	0	0	0
Total other comprehensive income (loss), net of tax	(4,529)	(1,075)	(2,859)	643	(7,388)	(432)
Accumulated other comprehensive income (loss), net of tax, ending balance	(21,434)	(14,586)	(16,905)	(13,511)	(21,434)	(14,586)
Pensions, Net of Tax
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive income (loss), net of tax, beginning balance	(38,881)	(45,546)	(39,802)	(52,232)	(39,802)	(52,232)
Other comprehensive loss before reclassifications	0	2,534	0	4,686
Amounts reclassified to net earnings, net of tax	1,581	1,787	921	2,000
Total other comprehensive income (loss), net of tax	1,581	4,321	921	6,686	2,502	11,007
Accumulated other comprehensive income (loss), net of tax, ending balance	$ (37,300)	$ (41,225)	$ (38,881)	$ (45,546)	$ (37,300)	$ (41,225)