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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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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 (Details) (USD $) In Millions, unless otherwise specified			6 Months Ended			6 Months Ended
	Apr. 30, 2011 Acquired technology [Member] Coradiant Inc [Member]	Apr. 30, 2011 Customer relations [Member] Coradiant Inc [Member]	Sep. 30, 2011 Coradiant Inc [Member] Year	Apr. 30, 2011 Coradiant Inc [Member]	Jun. 30, 2011 Acquired technology [Member] Aeroprise Inc and Neon Enterprise Software [Member]	Sep. 30, 2011 Aeroprise Inc and Neon Enterprise Software [Member] Year	Jun. 30, 2011 Aeroprise Inc and Neon Enterprise Software [Member]	Jun. 30, 2011 Aeroprise Inc [Member] Enterprise Service Management [Member]	Sep. 30, 2011 Neon Enterprise Software [Member] Mainframe Service Management [Member]
Business Acquisition, Cost of Acquired Entity, Purchase Price [Abstract]
Cash consideration of business acquisition				$ 130.0
Purchase consideration of completed acquisitions							21.0
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired assets and assumed liabilities	18.1	22.7			11.2
Weighted-average economic lives of acquired intangible assets			3			3
Business Acquisition, Purchase Price Allocation, Goodwill [Abstract]
Allocation of goodwill				$ 93.2				$ 7.7	$ 6.0