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Investments (Details) - USD ($)	Aug. 01, 2026	Apr. 30, 2026	Apr. 13, 2026	Dec. 22, 2025
Short-term investments:
Total short-term investments	$ 301,837,000	$ 254,972,000
Long-term investments:
Total long-term investments	$ 94,777,000	$ 81,128,000
Investment, Type [Extensible Enumeration]	Available-for-sale securities	Available-for-sale securities
Investments at cost	$ 8,000,000	$ 8,000,000	$ 5,000,000	$ 3,000,000
U.S. government securities
Short-term investments:
Total short-term investments	161,879,000	137,759,000
Long-term investments:
Total long-term investments	20,879,000	14,106,000
Corporate securities
Short-term investments:
Total short-term investments	139,958,000	117,213,000
Long-term investments:
Total long-term investments	11,962,000	6,953,000
Investment in limited partnership funds
Long-term investments:
Equity method investments	53,936,000	52,069,000
Available-for-sale securities
Long-term investments:
Total long-term investments	40,841,000	29,059,000
Equity method investments
Long-term investments:
Total long-term investments	$ 53,936,000	$ 52,069,000