Intangible Assets and Goodwill (Narrative) (Details)
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3 Months Ended |
6 Months Ended |
12 Months Ended |
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Dec. 02, 2014
USD ($)
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May. 31, 2015
USD ($)
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May. 31, 2014
USD ($)
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May. 31, 2015
USD ($)
Segments
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May. 31, 2014
USD ($)
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Nov. 30, 2014
USD ($)
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| Finite-Lived Intangible Assets [Line Items] |
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| Intangible assets, amortization expense |
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$ 7,300,000
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$ 700,000
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$ 15,100,000
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$ 1,400,000
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| Number of reporting units | Segments |
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3
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| Goodwill impairment loss |
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$ 0
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| Telerik AD [Member] |
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| Finite-Lived Intangible Assets [Line Items] |
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| Acquired intangible assets |
$ 123,100,000
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| Acquired intangible assets, useful life |
5 years
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5 years
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| Intangible assets, amortization expense |
|
|
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$ 12,300,000
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| Telerik AD [Member] | Existing Technology [Member] |
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| Finite-Lived Intangible Assets [Line Items] |
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| Acquired intangible assets |
$ 64,800,000
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| Telerik AD [Member] | Customer-related and other [Member] |
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| Finite-Lived Intangible Assets [Line Items] |
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| Acquired intangible assets |
47,100,000
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| Telerik AD [Member] | Trademarks and trade names [Member] |
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| Finite-Lived Intangible Assets [Line Items] |
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| Acquired intangible assets |
$ 11,200,000
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