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Commitments and Contingencies - Contingent Acquisition Obligations (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
	Dec. 31, 2017	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2021
Contingent Acquisition Obligations
Beginning fair value		$ 19,431
Additions		68
Foreign currency translation adjustment		(119)
Change in fair value		(2,426)
Ending fair value		16,954
Legal Proceedings
Legal fees, settlements and related costs, net	$ 12,500	2,235	$ (40)
Other accrued expenses and current liabilities		12,500
Prepaid expenses and other assets		62,870		$ 43,930
Arkansas Teacher Retirement Systems
Legal Proceedings
Prepaid expenses and other assets		12,500
Other business acquisitions
Contingent Acquisition Obligations
Remaining maximum amount of contingent consideration		32,400
Payments for contingent consideration		$ 300	$ 100
Mr. Chopra, Chief Executive Officer | Deferred bonus
Indemnifications and Certain Employment-Related Contingencies
Bonus payment on or within 45 days of January 1, 2024 contingent upon continued employment through that date	$ 13,500
Maximum number of days after January 1, 2024, bonus payment due	45 days

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The amount of increase or decrease in the foreign currency translation adjustment.

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The contingent liability as of the balance sheet date to an individual under a deferred compensation arrangement.

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Amount of expenses incurred of accrued and current liabilities.

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Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

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Amount of liability recognized arising from contingent consideration in a business combination.

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