Marketable Securities - Summary of Available-for-Sale Debt Securities in Unrealized Loss Position and Included in Accumulated Other Comprehensive (Loss), Aggregated by Length of Time Investments (Detail) - USD ($) $ in Thousands	May 31, 2024	May 31, 2023
Investments, Debt and Equity Securities [Abstract]
Total investments with unrealized losses, fair value	$ 25,464	$ 24,245
Unrealized losses with a loss position for less than 12 months, fair value	4,866	6,285
Unrealized losses with a loss position for more than 12 months, fair value	20,598	17,960
Total investments with unrealized losses, gross unrealized losses	(1,796)	(1,855)
Unrealized losses with a loss position for less than 12 months, gross unrealized losses	(36)	(72)
Unrealized losses with a loss position for more than 12 months, gross unrealized losses	$ (1,760)	$ (1,783)