Note 15 - Fair Value Measurements (Tables)

12 Months Ended

Sep. 30, 2025

Notes Tables

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

	As of September 30, 2025
Description	Total Fair Value		Level 1		Level 2		Level 3
Assets:
Cash equivalents	$	149,790	$	148,539	$	1,251	$	—
Available-for-sale securities		262,722		8,027		254,695		—
Investment in equity securities		2,100		—		—		2,100
Foreign exchange contracts		21		—		21		—
Total assets	$	414,633	$	156,566	$	255,967	$	2,100
Liabilities:
Net investment hedge		33,420		—		33,420		—
Foreign exchange contracts		120		—		120		—
Total liabilities	$	33,540	$	—	$	33,540	$	—

	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	$	—