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Income Taxes - Schedule Of Deferred Tax Assets And Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
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Deferred tax assets: |  |  |  |
Net operating loss carryforwards | $ 65,383 | $ 61,495 |  |
Foreign tax credits | 36,287 | 8,074 |  |
Capitalized research and development | 27,546 | 30,109 |  |
Pension benefits | 14,097 | 14,370 |  |
Prepaid expenses | 12,540 | 13,579 |  |
Deferred revenue | 2,274 | 6,021 |  |
Stock-based compensation | 15,822 | 13,630 |  |
Other reserves not currently deductible | 16,796 | 15,130 |  |
Amortization of intangible assets | 147,385 | 162,426 |  |
Research and development and other tax credits | 74,846 | 70,695 |  |
Lease liabilities | 51,471 | 52,224 |  |
Fixed assets | 53,025 | 47,457 |  |
Capital loss carryforward | 35,156 | 35,851 |  |
Other | 2,269 | 1,849 |  |
Gross deferred tax assets | 554,897 | 532,910 |  |
Valuation allowance | (52,085) | (205,423) | $ (177,663) | $ (141,950)
Total deferred tax assets | 502,812 | 327,487 |  |
Deferred tax liabilities: |  |  |  |
Acquired intangible assets not deductible | (108,746) | (65,894) |  |
Lease assets | (37,273) | (35,885) |  |
Pension prepayments | (2,834) | (1,155) |  |
Deferred revenue | (2,662) | (594) |  |
Depreciation | (7,121) | (7,481) |  |
Unbilled accounts receivable | (6,391) | (12,699) |  |
Deferred income | (21,744) | (5,821) |  |
Prepaid commissions | (16,990) | (17,124) |  |
Other | (5,427) | (2,302) |  |
Total deferred tax liabilities | (209,188) | (148,955) |  |
Net deferred tax assets | $ 293,624 | $ 178,532 |  |

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