Investments (Details) - USD ($)	Apr. 30, 2024	Jan. 31, 2024
Disclosure Text Block Supplement [Abstract]
Retained Earnings, Undistributed Earnings from Equity Method Investees	$ 16,600,000	$ 14,900,000
Short-Term Investments	$ 120,564,000	$ 155,260,000
Debt Securities, Held-to-Maturity, Weighted Average Yield, Maturity, Year One	5.40%	5.50%
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss	$ 80,000	$ 94,000

Weighted average yield of investment in debt security measured at amortized cost (held-to-maturity) maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1403
-Paragraph a
-Subparagraph (1)
-Publisher SEC

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Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity).

+ References

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-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
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-Subparagraph (c)
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Amount of consolidated retained earnings that represent undistributed (not yet received) earnings from 50 percent or less owned persons accounted for by the equity method (equity method investees).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
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-Subparagraph (SX 210.4-08(e)(2))
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Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.

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