Goodwill, Capitalized Software and Other Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2013
Goodwill [Line Items]
Goodwill as of beginning of period			$ 722,042
Effect of foreign currency translation			13,369
Goodwill as of end of period	735,411		735,411
Capitalized software and other intangible assets [Abstract]
Gross Carrying Amount, amortized intangible assets	466,892		466,892		480,909
Accumulated Amortization	(361,638)		(361,638)		(368,674)
Net Carrying Amount, amortized intangible assets	105,254		105,254		112,235
Amortization expense of finite-lived intangible assets [Abstract]
Amortization Expense	9,011	8,256	27,289	24,200
Future amortization expense of finite-lived intangible assets [Abstract]
2014	36,936		36,936
2015	31,916		31,916
2016	27,483		27,483
2017	17,379		17,379
2018	10,264		10,264
Thereafter	8,565		8,565
Capitalized Software [Member]
Capitalized software and other intangible assets [Abstract]
Amortization period			5 years
Future amortization expense of finite-lived intangible assets [Abstract]
2014	29,721		29,721
2015	26,995		26,995
2016	23,341		23,341
2017	13,402		13,402
2018	6,431		6,431
Thereafter	1,850		1,850
Capitalized Software [Member] | Internally Developed [Member]
Capitalized software and other intangible assets [Abstract]
Gross Carrying Amount, amortized intangible assets	262,752		262,752		243,872
Accumulated Amortization	(199,872)		(199,872)		(184,732)
Net Carrying Amount, amortized intangible assets	62,880		62,880		59,140
Amortization expense of finite-lived intangible assets [Abstract]
Amortization Expense	5,219	3,965	15,141	11,228
Capitalized Software [Member] | Purchased [Member]
Capitalized software and other intangible assets [Abstract]
Gross Carrying Amount, amortized intangible assets	131,395		131,395		165,117
Accumulated Amortization	(114,425)		(114,425)		(142,453)
Net Carrying Amount, amortized intangible assets	16,970		16,970		22,664
Amortization expense of finite-lived intangible assets [Abstract]
Amortization Expense	1,988	2,420	6,749	7,199
Customer Relationship [Member]
Capitalized software and other intangible assets [Abstract]
Gross Carrying Amount, amortized intangible assets	52,232		52,232		52,036
Accumulated Amortization	(28,387)		(28,387)		(25,281)
Net Carrying Amount, amortized intangible assets	23,845		23,845		26,755
Amortization expense of finite-lived intangible assets [Abstract]
Amortization Expense	1,034	1,045	3,097	3,130
Future amortization expense of finite-lived intangible assets [Abstract]
2014	4,133		4,133
2015	4,142		4,142
2016	4,142		4,142
2017	3,977		3,977
2018	3,833		3,833
Thereafter	6,715		6,715
Customer Relationship [Member] | Internally Developed [Member]
Capitalized software and other intangible assets [Abstract]
Amortization period			10 years
Other Amortizable Intangible Assets [Member]
Capitalized software and other intangible assets [Abstract]
Gross Carrying Amount, amortized intangible assets	20,513		20,513		19,884
Accumulated Amortization	(18,954)		(18,954)		(16,208)
Net Carrying Amount, amortized intangible assets	1,559		1,559		3,676
Amortization period			3 years
Amortization expense of finite-lived intangible assets [Abstract]
Amortization Expense	770	826	2,302	2,643
Future amortization expense of finite-lived intangible assets [Abstract]
2014	3,082		3,082
2015	779		779
2016	0		0
2017	0		0
2018	0		0
Thereafter	0		0
Trademarks [Member]
Capitalized software and other intangible assets [Abstract]
Gross Carrying Amount, unamortized intangible assets	4,394		4,394		4,428
Net Carrying Amount, unamortized intangible assets	4,394		4,394		4,428
Application Performance Management [Member]
Goodwill [Line Items]
Goodwill as of beginning of period			469,947
Effect of foreign currency translation			13,369
Goodwill as of end of period	483,316		483,316
Mainframe [Member]
Goodwill [Line Items]
Goodwill as of beginning of period			140,557
Effect of foreign currency translation			0
Goodwill as of end of period	140,557		140,557
Changepoint [Member]
Goodwill [Line Items]
Goodwill as of beginning of period			22,079
Effect of foreign currency translation			0
Goodwill as of end of period	22,079		22,079
Uniface [Member]
Goodwill [Line Items]
Goodwill as of beginning of period			21,280
Effect of foreign currency translation			0
Goodwill as of end of period	21,280		21,280
Professional Services [Member]
Goodwill [Line Items]
Goodwill as of beginning of period			42,794
Effect of foreign currency translation			0
Goodwill as of end of period	42,794		42,794
Application Services [Member]
Goodwill [Line Items]
Goodwill as of beginning of period			25,385
Effect of foreign currency translation			0
Goodwill as of end of period	$ 25,385		$ 25,385