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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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-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319

+ Details

Name:	us-gaap_IncomeTaxReconciliationTaxSettlements
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration