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Equity Incentive Plan (Total Stock Based Compensation Expense) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Share-based Payment Arrangement, Noncash Expense | $ 86,400 | $ 82,939 | $ 76,708
Sales And Marketing [Member] |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Share-based Payment Arrangement, Noncash Expense | 32,026 | 24,893 | 15,373
Research And Development [Member] |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Share-based Payment Arrangement, Noncash Expense | 22,019 | 13,488 | 13,968
General And Administrative [Member] |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Share-based Payment Arrangement, Noncash Expense | 20,416 | 33,033 | 34,756
License | Cost of Sales [Member] |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Share-based Payment Arrangement, Noncash Expense | 509 | 144 | (148)
Support and cloud services | Cost of Sales [Member] |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Share-based Payment Arrangement, Noncash Expense | 5,004 | 4,302 | 6,643
Professional services | Cost of Sales [Member] |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Share-based Payment Arrangement, Noncash Expense | $ 6,426 | $ 7,079 | $ 6,116

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