Fair Value Measurements (Tables)

12 Months Ended

Sep. 30, 2023

Fair Value Disclosures [Abstract]

Summary of assets and liabilities measured and recorded at fair value on a recurring basis

The following tables summarize assets and liabilities measured and recorded at fair value on a recurring basis in the accompanying Consolidated Balance Sheets as of September 30, 2023 and 2022 (in thousands):

	As of September 30, 2023
Description	Total Fair Value		Level 1		Level 2		Level 3
Assets:
Cash equivalents	$	525,952	$	525,952	$	—	$	—
Available-for-sale securities		450,211		85,949		364,262		—
Foreign exchange contracts		44		—		44		—
Net investment hedge		13,036		—		13,036		—
Total assets	$	989,243	$	611,901	$	377,342	$	—
Liabilities:
Foreign exchange contracts		421		—		421		—
Total liabilities	$	421	$	—	$	421	$	—

	As of September 30, 2022
Description	Total Fair Value		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	$	—