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Commitments And Contingencies (Narrative) (Details) ft² in Thousands | 3 Months Ended | 12 Months Ended | 60 Months Ended
--- | --- | --- | ---
Jan. 01, 2011 | Sep. 30, 2017 USD ($) ft² | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2015
Commitments And Contingencies [Line Items] |  |  |  |  |
Lease expense, net of sublease income |  | $ 35,800,000 | $ 37,200,000 | $ 36,900,000 |
Lease renewal term | 10 years |  |  |  |
Annual base rent plus operating expenses |  | 7,400,000 |  |  |
Operating Lease Utilities Cost |  | $ 1,500,000 |  |  |
Additional term of lease renewal |  | 10 years |  |  |
Landlord reimbursements |  | $ 12,800,000 |  |  |
Boston Lease Square Feet | ft² |  | 250 |  |  |
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 |  | 4,300,000 | 4,200,000 |  |
Bank guarantees outstanding collateralized |  | 1,200,000 | 1,200,000 |  |
Accounts receivable, net of allowance for doubtful accounts of $1,062 and $1,012 at September 30, 2017 and 2016, respectively |  | 152,299,000 | 161,357,000 |  |
Pending or Threatened Litigation [Member] |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |
Loss contingency accrual |  | 300,000 | $ 3,600,000 |  |
Korea |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |
Income Tax Examination, Description |  |  |  |  | 12
Customer Contracts [Member] | Maximum [Member] |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |
Accounts receivable, net of allowance for doubtful accounts of $1,062 and $1,012 at September 30, 2017 and 2016, respectively |  | 17,300,000 |  |  |
Customer Contracts [Member] | Minimum [Member] |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |
Accounts receivable, net of allowance for doubtful accounts of $1,062 and $1,012 at September 30, 2017 and 2016, respectively |  | $ 0 |  |  |

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