Goodwill, Capitalized Software and Other Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Mar. 31, 2014
Goodwill [Line Items]
Goodwill as of beginning of period			$ 648,546
Effect of foreign currency translation			(16,440)
Goodwill as of end of period	632,106		632,106
Capitalized software and other intangible assets [Abstract]
Gross Carrying Amount, amortized intangible assets	426,498		426,498		415,175
Accumulated Amortization	(331,360)		(331,360)		(316,771)
Net Carrying Amount, amortized intangible assets	95,138		95,138		98,404
Amortization expense of finite-lived intangible assets [Abstract]
Amortization Expense	8,062	9,010	16,865	17,709
Future amortization expense of finite-lived intangible assets [Abstract]
2015	33,330		33,330
2016	30,900		30,900
2017	21,498		21,498
2018	13,532		13,532
2019	8,582		8,582
Thereafter	4,161		4,161
Capitalized Software [Member]
Capitalized software and other intangible assets [Abstract]
Amortization period			5 years
Future amortization expense of finite-lived intangible assets [Abstract]
2015	28,426		28,426
2016	26,787		26,787
2017	17,549		17,549
2018	9,727		9,727
2019	4,777		4,777
Thereafter	1,345		1,345
Capitalized Software [Member] | Internally Developed [Member]
Capitalized software and other intangible assets [Abstract]
Gross Carrying Amount, amortized intangible assets	239,895		239,895		225,249
Accumulated Amortization	(176,359)		(176,359)		(165,720)
Net Carrying Amount, amortized intangible assets	63,536		63,536		59,529
Amortization expense of finite-lived intangible assets [Abstract]
Amortization Expense	5,366	4,817	10,640	9,353
Capitalized Software [Member] | Purchased [Member]
Capitalized software and other intangible assets [Abstract]
Gross Carrying Amount, amortized intangible assets	120,141		120,141		122,396
Accumulated Amortization	(109,084)		(109,084)		(107,116)
Net Carrying Amount, amortized intangible assets	11,057		11,057		15,280
Amortization expense of finite-lived intangible assets [Abstract]
Amortization Expense	1,664	2,391	3,378	4,761
Customer Relationship [Member]
Capitalized software and other intangible assets [Abstract]
Gross Carrying Amount, amortized intangible assets	46,706		46,706		47,000
Accumulated Amortization	(26,161)		(26,161)		(24,185)
Net Carrying Amount, amortized intangible assets	20,545		20,545		22,815
Amortization period			10 years
Amortization expense of finite-lived intangible assets [Abstract]
Amortization Expense	1,032	1,032	2,067	2,063
Future amortization expense of finite-lived intangible assets [Abstract]
2015	4,124		4,124
2016	4,113		4,113
2017	3,949		3,949
2018	3,805		3,805
2019	3,805		3,805
Thereafter	2,816		2,816
Other Amortizable Intangible Assets [Member]
Capitalized software and other intangible assets [Abstract]
Gross Carrying Amount, amortized intangible assets	19,756		19,756		20,530
Accumulated Amortization	(19,756)		(19,756)		(19,750)
Net Carrying Amount, amortized intangible assets	0		0		780
Amortization period			3 years
Amortization expense of finite-lived intangible assets [Abstract]
Amortization Expense	0	770	780	1,532
Future amortization expense of finite-lived intangible assets [Abstract]
2015	780		780
2016	0		0
2017	0		0
2018	0		0
2019	0		0
Thereafter	0		0
Unamortized Intangible Assets [Member]
Capitalized software and other intangible assets [Abstract]
Gross Carrying Amount, unamortized intangible assets	667		667		358
Net Carrying Amount, unamortized intangible assets	667		667		358
Dynatrace [Member]
Goodwill [Line Items]
Goodwill as of beginning of period			482,857
Effect of foreign currency translation			(16,440)
Goodwill as of end of period	466,417		466,417
Mainframe [Member]
Goodwill [Line Items]
Goodwill as of beginning of period			140,304
Effect of foreign currency translation			0
Goodwill as of end of period	140,304		140,304
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