Goodwill & Intangible Assets (Schedule Of Acquired Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Mar. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Cost	$ 81,912	$ 68,036
Accumulated Amortization	(27,227)	(20,350)
Net	54,685	47,686
Acquired Software [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	24,919	19,900
Accumulated Amortization	(17,943)	(13,598)
Net	6,976	6,302
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	32,754	29,200
Accumulated Amortization	(8,492)	(6,437)
Net	24,262	22,763
Indefinite Lived Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization	0	0
Indefinite lived trade name, Cost and Net	18,600	18,600
Core Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	4,760
Accumulated Amortization	(306)
Net	4,454
Net Beneficial Leases [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	336	336
Accumulated Amortization	(334)	(315)
Net	2	21
Non-Compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	343
Accumulated Amortization	(57)
Net	286
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	200
Accumulated Amortization	(95)
Net	$ 105