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Commitments and Contingencies (Narrative) (Details) ft² in Thousands | 12 Months Ended
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Sep. 30, 2019 USD ($) ft² | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($)
Commitments And Contingencies [Line Items] |  |  |
Lease expense, net of sublease income | $ 39,300,000 | $ 36,900,000 | $ 35,800,000
Boston lease, square feet | ft² | 250,000 |  |
Boston lease year one payments | $ 11,000,000.0 |  |
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 | 15,100,000 | 15,500,000 |
Bank guarantees outstanding collateralized | 1,100,000 | $ 1,100,000 |
Pending or Threatened Litigation [Member] |  |  |
Commitments And Contingencies [Line Items] |  |  |
Loss contingency accrual | 500,000 |  |
Minimum [Member] |  |  |
Commitments And Contingencies [Line Items] |  |  |
Loss Contingency, Estimate of Possible Loss | 500,000 |  |
Maximum [Member] |  |  |
Commitments And Contingencies [Line Items] |  |  |
Loss Contingency, Estimate of Possible Loss | 1,600,000 |  |
Paid in 2017 [Member] | Korea |  |  |
Commitments And Contingencies [Line Items] |  |  |
Income Tax Examination, Estimate of Possible Loss | 12,000,000 |  |
Additional Exposure [Member] | Korea |  |  |
Commitments And Contingencies [Line Items] |  |  |
Income Tax Examination, Estimate of Possible Loss | $ 13,000,000 |  |

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