CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jul. 31, 2024	Jul. 31, 2023
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 26,080	$ 14,876
Adjustments to reconcile net income to net cash provided by operating activities
Changes in accrued interest on investments	2,716	(341)
Stock compensation expense	2,215	2,218
Lease expense	1,415	884
Depreciation	943	1,035
Deferred income tax expense (benefit)	469	(196)
Amortization of intangible assets	195	196
Other	995	162
Changes in operating assets and liabilities
Accounts receivable	(48,492)	5,600
Contract assets	2,103	4,031
Other assets	(10,661)	(5,176)
Accounts payable and accrued expenses	40,521	(8,931)
Contract liabilities	72,682	20,195
Net cash provided by operating activities	91,181	34,553
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of short-term investments	(57,500)	(90,000)
Maturities of short-term investments	95,000	159,750
Purchases of available-for-sale securities	(85,309)	(60,261)
Maturities of available-for-sale securities	9,230
Purchases of property, plant and equipment	(2,671)	(1,031)
Investments in solar energy projects	(3,312)
Net cash (used in) provided by investing activities	(44,562)	8,458
CASH FLOWS FROM FINANCING ACTIVITIES
Common stock repurchases	(187)	(6,738)
Payments of cash dividends	(8,068)	(6,699)
Proceeds from share-based award settlements, net of withholding taxes paid	(2,425)	947
Net cash used in financing activities	(10,680)	(12,490)
EFFECTS OF EXCHANGE RATE CHANGES ON CASH	(286)	331
NET INCREASE IN CASH AND CASH EQUIVALENTS	35,653	30,852
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	197,032	173,947
CASH AND CASH EQUIVALENTS, END OF PERIOD	232,685	204,799
NON-CASH INVESTING AND FINANCING ACTIVITIES
Right-of-use assets obtained in exchange for lease obligations	1,531	665
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid for income taxes, net of refunds	9,138	3,270
Cash paid for operating leases	$ 1,410	$ 888