Fair Value Measurements (Tables)

3 Months Ended

Dec. 31, 2022

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured at Fair Value on Recurring Basis

			Fair Value Measurements at Reporting Date Using
			Quoted Prices in				Significant
			Active Markets for		Significant Other		Unobservable
	December 31,		Identical Assets		Observable Inputs		Inputs
Description	2022		(Level 1)		(Level 2)		(Level 3)
Assets:
Cash equivalents	$	443,240	$	443,240	$	—	$	—
Available-for-sale securities		827,572		284,015		543,557		—
Foreign exchange contracts		146		—		146		—
Net investment hedge		47,953		—		47,953		—
Total assets	$	1,318,911	$	727,255	$	591,656	$	—
Liabilities:
Contingent consideration liability	$	18,462	$	—	$	—	$	18,462
Foreign exchange contracts		276		—		276		—
Total liabilities	$	18,738	$	—	$	276	$	18,462

			Fair Value Measurements at Reporting Date Using
			Quoted Prices in				Significant
			Active Markets for		Significant Other		Unobservable
	September 30,		Identical Assets		Observable Inputs		Inputs
Description	2022		(Level 1)		(Level 2)		(Level 3)
Assets:
Cash equivalents	$	374,804	$	374,055	$	749	$	—
Available-for-sale securities		1,263,782		651,800		611,982		—
Foreign exchange contracts		634		—		634		—
Net investment hedge		124,789		—		124,789		—
Total assets	$	1,764,009	$	1,025,855	$	738,154	$	—
Liabilities:
Foreign exchange contracts		230	$	—		230		—
Total liabilities	$	230	$	—	$	230	$	—