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Commitments And Contingencies (Narrative) (Details) ft² in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2010 | Sep. 30, 2018 USD ($) ft² | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($)
Commitments And Contingencies [Line Items] |  |  |  |
Lease expense, net of sublease income |  | $ 36,900,000 | $ 35,800,000 | $ 37,200,000
Lease renewal term | 10 years |  |  |
Additional term of lease renewal |  | 10 years |  |
Annual base rent plus operating expenses |  | $ 7,400,000 |  |
Operating Lease Utilities Cost |  | 1,600,000 |  |
Landlord reimbursements |  | $ 12,800,000 |  |
Boston Lease Square Feet | ft² |  | 250,000 |  |
Boston lease year one payments |  | $ 11,000,000 |  |
Boston lease per square foot annual increase |  | 1 |  |
Boston lease annual increase |  | $ 300,000 |  |
Boston lease building operating cost percent |  | 63.00% |  |
Boston lease building operating cost amount estimate year one |  | $ 7,100,000 |  |
Boston lease leasehold improvement allowance |  | 25,000,000 |  |
Boston lease leasehold improvement allowance per square foot |  | 100 |  |
Letters of credit and bank guarantees outstanding |  | 15,500,000 | 4,300,000 |
Bank guarantees outstanding collateralized |  | 1,100,000 | 1,200,000 |
Allowance for Sales Credits |  | 2,000,000 |  |
Pending or Threatened Litigation [Member] |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |
Loss contingency accrual |  | 900,000 | $ 300,000 |
Korea |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |
Income Tax Examination, Estimate of Possible Loss |  | 12,000,000 |  |
Minimum [Member] |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |
Loss Contingency, Estimate of Possible Loss |  | 700,000 |  |
Maximum [Member] |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |
Loss Contingency, Estimate of Possible Loss |  | 5,000,000 |  |
Customer Contracts [Member] |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |
Net revenue write-down |  | 9,300,000 |  |
Technology Services Revenue [Member] | Customer Contracts [Member] |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |
Net revenue write-down |  | 14,500,000 |  |
License Revenue [Member] | Customer Contracts [Member] |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |
Net revenue write-down offset |  | $ 5,200,000 |  |

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