Fair Value Measurements (Tables)

6 Months Ended

Mar. 31, 2024

Fair Value Disclosures [Abstract]

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

	As of March 31, 2024
Description	Total Fair Value		Level 1		Level 2		Level 3
Assets:
Cash equivalents	$	195,397	$	180,755	$	14,642	$	—
Available-for-sale securities		611,238		225,926		385,312		—
Foreign exchange contracts		217		—		217		—
Net investment hedge		350		—		350		—
Total assets	$	807,202	$	406,681	$	400,521	$	—
Liabilities:
Foreign exchange contracts		141		—		141		—
Total liabilities	$	141	$	—	$	141	$	—

	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	$	—