Restructuring And Impairment Costs (Reconciliation Of Company's Liability For The Restructuring Costs) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				12 Months Ended
	Sep. 30, 2012	Mar. 31, 2012	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Restructuring Cost and Reserve [Line Items]
Costs charged to expense	$ 3,700	$ 1,400	$ 3,000	$ 6,900	$ 4,113	$ 11,661	$ 11,791
Payments					5,293	16,710	5,180
Balance		1,562			382	1,562	6,611
Employee Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Costs charged to expense				3,800	4,113	8,564	11,155
Payments					5,002	13,679	4,769
Balance		1,271			(382)	1,271	6,386
Other Costs [Member]
Restructuring Cost and Reserve [Line Items]
Costs charged to expense					0	3,097	636
Payments					291	3,031	411
Balance		$ 291			$ 0	$ 291	$ 225