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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, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Reconciliation, Amount |  |  |
Statutory federal income tax rate | $ 28,288 | $ 4,263 | $ 7,021
Change in valuation allowance | (16,489) | 66,417 | (181,047)
Transition impact of U.S. Tax Act | 0 | 0 | 126,122
Federal rate change | 0 | 0 | 69,648
State income taxes, net of federal tax benefit | (2,998) | 607 | 2,401
Federal research and development credits | (5,483) | (3,731) | (3,058)
Uncertain tax positions | 3,072 | 2,611 | (4,646)
Foreign rate differences | (22,074) | (26,952) | (38,743)
Foreign tax on U.S. provision | 4,523 | 6,547 | 2,736
Excess tax benefits from restricted stock | (1,743) | (5,940) | (11,641)
Audits and settlements | 0 | 51 | 2,352
U.S. permanent items | 6,590 | 2,483 | 5,408
BEAT | (1,759) | 1,759 | 0
GILTI, net of foreign tax credits | 14,899 | 6,170 | 0
Foreign-Derived Intangible Income (FDII) | (2,461) | (6,409) | 0
Other, net | (354) | (116) | 116
Total provision (benefit) for income taxes | $ 4,011 | $ 47,760 | $ (23,331)
Reconciliation, Percent |  |  |
Statutory federal income tax rate | 21.00% | 21.00% | 25.00%
Change in valuation allowance | (12.00%) | 327.00% | (632.00%)
Transition impact of U.S. Tax Act | 0.00% | 0.00% | 440.00%
Federal rate change | 0.00% | 0.00% | 243.00%
State income taxes, net of federal tax benefit | (2.00%) | 3.00% | 8.00%
Federal research and development credits | (4.00%) | (18.00%) | (11.00%)
Uncertain tax positions | 2.00% | 13.00% | (16.00%)
Foreign rate differences | (16.00%) | (133.00%) | (135.00%)
Foreign tax on U.S. provision | 3.00% | 32.00% | 10.00%
Excess tax benefits from restricted stock | (1.00%) | (29.00%) | (41.00%)
Audits and settlements | 0.00% | 0.00% | 8.00%
U.S. permanent items | 5.00% | 12.00% | 19.00%
BEAT | (1.00%) | 9.00% | 0.00%
GILTI, net of foreign tax credits | 11.00% | 31.00% | 0.00%
Foreign-Derived Intangible Income (FDII) | (2.00%) | (32.00%) | 0.00%
Other, net | (1.00%) | (1.00%) | 1.00%
Provision (benefit) for income taxes | 3.00% | 235.00% | (81.00%)

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