Schedule II Valuation and Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Excess and obsolete inventory reserves [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance, beginning	$ 18,900	$ 19,859	$ 19,990
Additions Charged to Expense	3,586	1,648	1,408
Additions from Acquisitions	0	32	17
Reductions from Reserves	(4,392)	(2,639)	(1,556)
Other	(54)	0	0
Balance, ending	18,040	18,900	19,859
Allowance for doubtful accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance, beginning	6,273	7,121	9,505
Additions Charged to Expense	3,556	3,006	2,674
Additions from Acquisitions	0	12	2
Reductions from Reserves	(3,531)	(3,866)	(5,060)
Other	2	0	0
Balance, ending	$ 6,300	$ 6,273	$ 7,121