Goodwill & Intangible Assets (Schedule Of Acquired Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Mar. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Cost	$ 81,752	$ 68,036
Accumulated Amortization	(25,362)	(20,350)
Net	56,390	47,686
Acquired Software [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	24,888	19,900
Accumulated Amortization	(16,802)	(13,598)
Net	8,086	6,302
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	32,713	29,200
Accumulated Amortization	(7,930)	(6,437)
Net	24,783	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	4,700
Accumulated Amortization	(205)
Net	4,495
Net Beneficial Leases [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	336	336
Accumulated Amortization	(332)	(315)
Net	4	21
Non-Compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	333
Accumulated Amortization	(28)
Net	305
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	182
Accumulated Amortization	(65)
Net	$ 117