CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Oct. 31, 2024	Oct. 31, 2023
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 54,090	$ 20,340
Adjustments to reconcile net income to net cash provided by operating activities
Changes in accrued interest on investments	2,992	(1,876)
Stock compensation expense	3,390	3,416
Lease expense	2,415	1,335
Depreciation	1,376	1,524
Deferred income tax expense	1,060	497
Amortization of intangible assets	293	294
Other	1,006	287
Changes in operating assets and liabilities
Accounts receivable	(85,084)	168
Contract assets	3,569	(613)
Other assets	4,514	(2,977)
Accounts payable and accrued expenses	43,707	9,960
Contract liabilities	89,632	59,908
Net cash provided by operating activities	122,960	92,263
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of short-term investments	(135,000)	(115,000)
Maturities of short-term investments	117,500	159,750
Purchases of available-for-sale securities	(110,045)	(104,492)
Maturities of available-for-sale securities	9,230
Purchases of property, plant and equipment	(5,218)	(2,143)
Investments in solar energy projects	(3,312)
Net cash used in investing activities	(126,845)	(61,885)
CASH FLOWS FROM FINANCING ACTIVITIES
Common stock repurchases	(646)	(8,467)
Payments of cash dividends	(13,263)	(10,686)
Settlements of share-based awards, net of withholding taxes paid	(3,704)	1,107
Net cash used in financing activities	(17,613)	(18,046)
EFFECTS OF EXCHANGE RATE CHANGES ON CASH	(185)	(710)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(21,683)	11,622
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	197,032	173,947
CASH AND CASH EQUIVALENTS, END OF PERIOD	175,349	185,569
NON-CASH INVESTING AND FINANCING ACTIVITIES
Right-of-use assets obtained in exchange for lease obligations	1,995	706
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid for income taxes, net of refunds	15,133	7,022
Cash paid for operating leases	$ 2,404	$ 1,340