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Business Combinations (Acquisition of Coverity, Inc. (Coverity)) - Additional Information (Detail) (Coverity Inc, USD $) | 0 Months Ended |  |  | 9 Months Ended
--- | --- | --- | --- | ---
Mar. 24, 2014 | Jul. 31, 2014 | Mar. 24, 2014 | Jul. 31, 2014 Minimum | Jul. 31, 2014 Maximum
Business Acquisition [Line Items] |  |  |  |  |
Date of acquisition | Mar. 24, 2014 |  |  |  |
Total cash consideration | $ 375,500,000 |  |  |  |
Deferred revenue gross |  | 68,500,000 |  |  |
Deferred revenue |  | 21,270,000 | 21,270,000 |  |
Goodwill |  | 266,400,000 |  |  |
Identifiable intangibles assets acquired |  | 101,900,000 | 101,900,000 |  |
Definite lived intangible asset amortization period |  |  |  | 2 years | 8 years
Fair value of stock options assumed |  | $ 15,000,000 |  |  |

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