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Description of Business and Basis of Presentation (Tables) | 12 Months Ended
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Sep. 30, 2016
Description Of Business And Basis Of Presentation [Abstract] |
Reclassifications | The following revenue and costs have been reclassified in the accompanying Consolidated Statements of Operations for the year ended September 30, 2015 and 2014 to conform to the current period presentation.
| Year Ended September 30,
| 2015 | 2014
Reclassifications within revenue | (in millions)
From L&S to Perpetual License | $ | 282.8 |  | $ | 362.6 |
From L&S to Subscription | 65.2 |  | 27.1 |
Reclassifications within cost of revenue |  |
From L&S to Software | $ | 53.2 |  | $ | 45.0 |
From Support to Software | 82.8 |  | 84.7 |
Reclassifications within operating expenses |  |
From General and Administrative to Selling and Marketing | $ | 8.0 |  | $ | 10.0 |

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- Definition Reclassifications [Table Text Block] + References No definition available. + Details
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