Note 15 - Fair Value Measurements (Tables)

12 Months Ended

Sep. 30, 2024

Notes Tables

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

	As of September 30, 2024
Description	Total Fair Value		Level 1		Level 2		Level 3
Assets:
Cash equivalents	$	157,990	$	157,990	$	—	$	—
Available-for-sale securities		198,616		37,584		161,032		—
Convertible debt securities		2,000		—		—		2,000
Foreign exchange contracts		9		—		9		—
Total assets	$	358,615	$	195,574	$	161,041	$	2,000
Liabilities:
Net investment hedge		1,915		—		1,915		—
Foreign exchange contracts		213		—		213		—
Total liabilities	$	2,128	$	—	$	2,128	$	—

	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	$	—