Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2025	Apr. 30, 2024
Statement of Cash Flows [Abstract]
Net income including non-controlling interests	$ 10,672	$ 12,273
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation	3,467	4,414
Amortization of operating lease right-of-use assets	1,552	1,478
Income from equity method investments	(1,006)	(1,718)
Interest income from investments	(1,740)	(1,816)
Deferred income tax	1,707	2,479
Stock-based compensation expense	394	716
Changes in assets and liabilities:
Accounts receivable	(6,465)	1,650
Inventories	1,167	(116)
Refundable income taxes	(915)	1,142
Other assets	69	(3,797)
Accounts payable, trade	(8,852)	(12,733)
Long-term taxes payable	279
Other liabilities	(3,805)	(6,235)
Net cash used in operating activities	(3,476)	(2,263)
Cash flows from investing activities:
Capital expenditures	(6,900)	(24,832)
Purchase of short-term investments	(41,419)	(84,978)
Maturity of short-term investments	50,000	121,490
Deposits	128	215
Net cash provided by investing activities	1,809	11,895
Cash flows from financing activities:
Treasury stock acquired	(32,670)
Payments to non-controlling interests holders	(2,005)	(1,829)
Net cash used in financing activities	(34,675)	(1,829)
Net (decrease) increase in cash and cash equivalents	(36,342)	7,803
Cash and cash equivalents, beginning of period	196,255	223,397
Cash and cash equivalents, end of period	159,913	231,200
Non-cash investing activities – Accrued capital expenditures	2,717	3,938
Non-cash investing activities – Capital additions transferred from prepaid expense	76
Non-cash financing activities – Stock awards accrued	301	358
Non-cash financing activities – Stock repurchases accrued	577
Non-cash financing activities – Excise tax on stock repurchases accrued	261
Prepaid lease payment, prior to lease commencement		15,600
Operating right-of-use assets acquired and liabilities incurred upon lease execution	3,007
Finance right-of-use assets acquired and liabilities incurred upon lease execution	$ 3,381