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Income Taxes - Summary of Federal Income Tax Rate and Effective Income Tax Rate (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Reconciliation, Amount |  |  |
Statutory federal income tax rate | $ 82,268 | $ 28,288 | $ 4,263
Change in valuation allowance | (134,695) | (16,489) | 66,417
State income taxes, net of federal tax benefit | (28,768) | (2,998) | 607
Federal research and development credits | (5,764) | (5,483) | (3,731)
Uncertain tax positions | 3,398 | 3,072 | 2,611
Foreign tax credit | (35,368) | 0 | 0
Foreign rate differences | (34,584) | (22,074) | (26,952)
Foreign tax on U.S. provision | 5,931 | 4,523 | 6,547
Excess tax benefits from restricted stock | (6,141) | (1,743) | (5,940)
Audits and settlements | 33,370 | 0 | 51
U.S. permanent items | 18,389 | 6,590 | 2,483
BEAT | 2,936 | (1,759) | 1,759
GILTI, net of foreign tax credits | 18,217 | 14,899 | 6,170
Foreign-Derived Intangible Income (FDII) | (4,428) | (2,461) | (6,409)
Other, net | 71 | (354) | (116)
Total provision (benefit) for income taxes | $ (85,168) | $ 4,011 | $ 47,760
Reconciliation, Percent |  |  |
Statutory federal income tax rate | 21.00% | 21.00% | 21.00%
Change in valuation allowance | (34.00%) | (12.00%) | 327.00%
State income taxes, net of federal tax benefit | (8.00%) | (2.00%) | 3.00%
Federal research and development credits | (2.00%) | (4.00%) | (18.00%)
Uncertain tax positions | 1.00% | 2.00% | 13.00%
Foreign tax credit | (9.00%) | 0.00% | 0.00%
Foreign rate differences | (9.00%) | (16.00%) | (133.00%)
Foreign tax on U.S. provision | 2.00% | 3.00% | 32.00%
Excess tax benefits from restricted stock | (2.00%) | (1.00%) | (29.00%)
Audits and settlements | 9.00% | 0.00% | 0.00%
U.S. permanent items | 5.00% | 5.00% | 12.00%
BEAT | 1.00% | (1.00%) | 9.00%
GILTI, net of foreign tax credits | 4.00% | 11.00% | 31.00%
Foreign-Derived Intangible Income (FDII) | (1.00%) | (2.00%) | (32.00%)
Other, net | 0.00% | (1.00%) | (1.00%)
Provision (benefit) for income taxes | (22.00%) | 3.00% | 235.00%

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