Other Comprehensive Income (Loss) Component of Accumulated Other Comprehensive Loss, Net of Tax (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Sep. 30, 2012	Jun. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (53,921)	$ (55,192)	$ (40,449)	$ (38,673)	$ (55,192)	$ (38,673)
Other comprehensive earnings before reclassifications	1,861	749	1,074	(1,776)
Amounts reclassified to net earnings, net of tax	522	522	(521)	0
Other comprehensive earnings, net of tax	2,383	1,271	553	(1,776)	3,654	(1,223)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(51,538)	(53,921)	(39,896)	(40,449)	(51,538)	(39,896)
Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(4,975)	(5,724)	(4,698)	(2,922)	(5,724)	(2,922)
Other comprehensive earnings before reclassifications	1,861	749	1,074	(1,776)
Amounts reclassified to net earnings, net of tax	0	0	0	0
Other comprehensive earnings, net of tax	1,861	749	1,074	(1,776)	2,610	(702)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(3,114)	(4,975)	(3,624)	(4,698)	(3,114)	(3,624)
Pensions, Net of Tax [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(48,946)	(49,468)	(35,751)	(35,751)	(49,468)	(35,751)
Other comprehensive earnings before reclassifications	0	0	0	0
Amounts reclassified to net earnings, net of tax	522	522	(521)	0
Other comprehensive earnings, net of tax	522	522	(521)	0	1,044	(521)
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (48,424)	$ (48,946)	$ (36,272)	$ (35,751)	$ (48,424)	$ (36,272)