Goodwill & Intangible Assets (Schedule Of Acquired Intangible Assets) (Details) (USD $) In Thousands	Sep. 30, 2011	Mar. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Cost	$ 72,489	$ 68,036
Accumulated Amortization	(23,550)	(20,350)
Net	48,939	47,686
Acquired Software [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	21,100	19,900
Accumulated Amortization	(15,691)	(13,598)
Net	5,409	6,302
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	29,650	29,200
Accumulated Amortization	(7,401)	(6,437)
Net	22,249	22,763
Indefinite Lived Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	18,600	18,600
Accumulated Amortization	0	0
Net	18,600	18,600
Core Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	2,700
Accumulated Amortization	(104)
Net	2,596
Net Beneficial Leases [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	336	336
Accumulated Amortization	(326)	(315)
Net	10	21
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	103
Accumulated Amortization	(28)
Net	$ 75