Realignment Obligations (Details) (USD $) In Thousands, unless otherwise specified	1 Months Ended	3 Months Ended	12 Months Ended
	Feb. 29, 2012 groupstructure	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Realignment obligations
Number of group structures	3
Realignment liability activity
Balance at the beginning of the period			$ 7,173	$ 0
Expense		8,966	0	8,966
Cash paid			(6,319)	(272)
Non-cash settlements			(854)	(1,521)
Balance at the end of the period		7,173	0	7,173
Termination benefits
Realignment liability activity
Balance at the beginning of the period			7,148	0
Expense		7,313	0	7,313
Cash paid			(6,294)	0
Non-cash settlements			(854)	(165)
Balance at the end of the period		7,148	0	7,148
Asset impairment
Realignment liability activity
Balance at the beginning of the period			0	0
Expense		978	0	978
Cash paid			0	0
Non-cash settlements			0	(978)
Balance at the end of the period		0	0	0
Facility closure and other costs
Realignment liability activity
Balance at the beginning of the period			25	0
Expense		675	0	675
Cash paid			(25)	(272)
Non-cash settlements			0	(378)
Balance at the end of the period		$ 25	$ 0	$ 25