Goodwill, Capitalized Software and Other Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Mar. 31, 2013
Goodwill [Line Items]
Goodwill as of beginning of period	$ 722,042
Effect of foreign currency translation	2,758
Goodwill as of end of period	724,800
Capitalized software and other intangible assets [Abstract]
Gross Carrying Amount, amortized intangible assets	487,177		480,909
Accumulated Amortization	(377,831)		(368,674)
Net Carrying Amount, amortized intangible assets	109,346		112,235
Amortization expense of finite-lived intangible assets [Abstract]
Amortization Expense	8,982	7,840
Future amortization expense of finite-lived intangible assets [Abstract]
2014	35,347
2015	28,454
2016	24,104
2017	14,804
2018	8,520
Thereafter	7,099
Capitalized Software [Member]
Capitalized software and other intangible assets [Abstract]
Amortization period	5 years
Future amortization expense of finite-lived intangible assets [Abstract]
2014	28,229
2015	23,593
2016	19,981
2017	10,846
2018	4,706
Thereafter	444
Capitalized Software [Member] | Internally Developed [Member]
Capitalized software and other intangible assets [Abstract]
Gross Carrying Amount, amortized intangible assets	249,617		243,872
Accumulated Amortization	(189,551)		(184,732)
Net Carrying Amount, amortized intangible assets	60,066		59,140
Amortization expense of finite-lived intangible assets [Abstract]
Amortization Expense	4,819	3,470
Capitalized Software [Member] | Purchased [Member]
Capitalized software and other intangible assets [Abstract]
Gross Carrying Amount, amortized intangible assets	165,497		165,117
Accumulated Amortization	(144,953)		(142,453)
Net Carrying Amount, amortized intangible assets	20,544		22,664
Amortization expense of finite-lived intangible assets [Abstract]
Amortization Expense	2,370	2,407
Customer Relationship [Member]
Capitalized software and other intangible assets [Abstract]
Gross Carrying Amount, amortized intangible assets	52,049		52,036
Accumulated Amortization	(26,284)		(25,281)
Net Carrying Amount, amortized intangible assets	25,765		26,755
Amortization expense of finite-lived intangible assets [Abstract]
Amortization Expense	1,031	1,044
Future amortization expense of finite-lived intangible assets [Abstract]
2014	4,123
2015	4,123
2016	4,123
2017	3,958
2018	3,814
Thereafter	6,655
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	20,014		19,884
Accumulated Amortization	(17,043)		(16,208)
Net Carrying Amount, amortized intangible assets	2,971		3,676
Amortization period	3 years
Amortization expense of finite-lived intangible assets [Abstract]
Amortization Expense	762	919
Future amortization expense of finite-lived intangible assets [Abstract]
2014	2,995
2015	738
2016	0
2017	0
2018	0
Thereafter	0
Trademarks [Member]
Capitalized software and other intangible assets [Abstract]
Gross Carrying Amount, unamortized intangible assets	4,402		4,428
Net Carrying Amount, unamortized intangible assets	4,402		4,428
Application Performance Management [Member]
Goodwill [Line Items]
Goodwill as of beginning of period	469,947
Effect of foreign currency translation	2,758
Goodwill as of end of period	472,705
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
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
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
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
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