The aggregate amount assigned to a major class of finite-lived intangible assets acquired either individually or as part of a group of assets (in either an asset acquisition or business combination). A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

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-Name Accounting Standards Codification

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The calculated weighted-average amortization period of a major class of finite-lived intangible assets acquired during the current period either individually or as part of a group of assets (in either an asset acquisition or business combination). A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

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Amount of cash paid to acquire the entity.

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The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition.

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Amount of goodwill arising from a business combination, which is the excess of the cost of the acquired entity over the amounts assigned to assets acquired and liabilities assumed.

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Business Combinations (Detail Textual) (USD $) In Millions, unless otherwise specified		1 Months Ended								1 Months Ended			1 Months Ended			12 Months Ended			12 Months Ended
	Feb. 03, 2012	Feb. 03, 2012 Acquired technology [Member] Y	Feb. 03, 2012 Customer relationships [Member] Y	Apr. 30, 2011 Coradiant Inc [Member] Y	Apr. 30, 2011 Coradiant Inc [Member] Enterprise Service Management [Member]	Apr. 30, 2011 Coradiant Inc [Member] Acquired technology [Member]	Apr. 30, 2011 Coradiant Inc [Member] Customer relationships [Member]	Jun. 30, 2011 Aeroprise Inc and Neon Enterprise Software [Member]	Jun. 30, 2011 Aeroprise Inc and Neon Enterprise Software [Member] Acquired technology [Member]	Jun. 30, 2011 Aeroprise Inc [Member] Y	Jun. 30, 2011 Aeroprise Inc [Member] Enterprise Service Management [Member]	Jun. 30, 2011 Aeroprise Inc [Member] Mainframe Service Management [Member]	Dec. 31, 2011 I/O Concepts Software Corporation [Member] Y	Dec. 31, 2011 I/O Concepts Software Corporation [Member] Mainframe Service Management [Member]	Feb. 03, 2012 Numara Software Holdings Inc [Member]	Mar. 31, 2011 Neptuny and GridApp Systems Acquisitions [Member] Y	Mar. 31, 2011 Neptuny and GridApp Systems Acquisitions [Member] Enterprise Service Management [Member]	Mar. 31, 2011 Neptuny and GridApp Systems Acquisitions [Member] Acquired technology [Member]	Mar. 31, 2010 MQSoftware Tideway Systems And Phurnace Software Acquisitions [Member] Y	Mar. 31, 2010 MQSoftware Tideway Systems And Phurnace Software Acquisitions [Member] Enterprise Service Management [Member]	Mar. 31, 2010 MQSoftware Tideway Systems And Phurnace Software Acquisitions [Member] Mainframe Service Management [Member]	Mar. 31, 2010 MQSoftware Tideway Systems And Phurnace Software Acquisitions [Member] Acquired technology [Member]	Mar. 31, 2010 MQSoftware Tideway Systems And Phurnace Software Acquisitions [Member] Customer relationships [Member]
Business Acquisition, Cost of Acquired Entity, Purchase Price [Abstract]
Cash consideration of business acquisition				$ 130.0											$ 305.9
Purchase consideration of completed acquisitions								21.0					14.1			51.5			94.3
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired assets and assumed liabilities	198.6	32.4	164.4			18.1	22.7		11.2				5.4					20.7				36.3	9.4
Weighted-average economic lives of acquired intangible assets		3	5	3						3			3			3			3
Business Acquisition, Purchase Price Allocation, Goodwill [Abstract]
Allocation of goodwill	$ 204.5				$ 91.7						$ 4.9	$ 6.0		$ 10.3			$ 34.2		$ 61.3	$ 48.5	$ 12.8