Accounts Receivable (Details) - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2021	Sep. 30, 2020
Receivables [Abstract]
Accounts receivable	$ 250,608	$ 264,536
Allowance for credit losses	(3,989)	(4,057)
Accounts receivable, net	246,619	$ 260,479
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at September 30, 2020	(4,057)
Charged to costs and expenses	(460)
Write-offs	562
Foreign currency and other	(34)
Balance at December 31, 2020	$ (3,989)