CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2025	Apr. 30, 2024
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 22,550	$ 7,882
Adjustments to reconcile net income to net cash provided by operating activities
Stock compensation expense	1,188	1,211
Right-of-use asset amortization	1,173	647
Depreciation	415	480
Changes in accrued interest on investments	1,265	3,544
Deferred income tax expense	340	263
Other	(1,014)	59
Changes in operating assets and liabilities
Accounts receivable	69,309	(12,636)
Contract assets	(1,928)	(6,196)
Other assets	(2,934)	(4,422)
Accounts payable and accrued expenses	(39,623)	7,479
Contract liabilities	(15,448)	19,375
Net cash provided by operating activities	35,293	17,686
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of short-term investments	(12,500)	(57,500)
Maturities of short-term investments	50,000	80,000
Purchases of available-for-sale securities	(27,189)	(29,824)
Maturities of available-for-sale securities	15,000	9,230
Purchases of property, plant and equipment	(395)	(322)
Investments in solar energy projects		(3,312)
Net cash provided by (used in) investing activities	24,916	(1,728)
CASH FLOWS FROM FINANCING ACTIVITIES
Common stock repurchases	(6,849)	(187)
Payments of cash dividends	(5,070)	(4,025)
Settlements of share-based awards, net of withholding taxes paid	(6,082)	(906)
Net cash used in financing activities	(18,001)	(5,118)
EFFECTS OF EXCHANGE RATE CHANGES ON CASH	1,780	(134)
NET INCREASE IN CASH AND CASH EQUIVALENTS	43,988	10,706
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	145,263	197,032
CASH AND CASH EQUIVALENTS, END OF PERIOD	189,251	207,738
NON-CASH INVESTING AND FINANCING ACTIVITIES
Right-of-use assets obtained in exchange for lease obligations	1,574	542
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid for income taxes, net of refunds	10	3,312
Cash paid for operating leases	$ 1,135	$ 651