CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Oct. 31, 2023	Oct. 31, 2022
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 20,340	$ 19,465
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Stock compensation expense	3,416	3,055
Changes in accrued interest on investments	(1,876)	(790)
Depreciation	1,524	2,296
Lease expense	1,335	1,871
Deferred income tax expense (benefit)	497	(209)
Amortization of intangible assets	294	611
Equity in loss (income) of solar energy investments	130	(1,112)
Other	157	20
Changes in operating assets and liabilities
Accounts receivable	168	(10,921)
Contract assets	(613)	(6,647)
Other assets	(2,977)	6,184
Accounts payable and accrued expenses	9,960	(7,952)
Contract liabilities	59,908	(78,859)
Net cash provided by (used in) operating activities	92,263	(72,988)
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of short-term investments	(115,000)	(249,750)
Maturities of short-term investments	159,750	190,000
Purchases of available-for-sale securities	(104,492)
Purchases of property, plant and equipment	(2,143)	(2,582)
Net cash used in investing activities	(61,885)	(62,332)
CASH FLOWS FROM FINANCING ACTIVITIES
Common stock repurchases	(8,467)	(63,252)
Payments of cash dividends	(10,686)	(10,588)
Proceeds from share-based award settlements	1,107	66
Net cash used in financing activities	(18,046)	(73,774)
EFFECTS OF EXCHANGE RATE CHANGES ON CASH	(710)	(5,313)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	11,622	(214,407)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	173,947	350,472
CASH AND CASH EQUIVALENTS, END OF PERIOD	185,569	136,065
NON-CASH INVESTING AND FINANCING ACTIVITIES
Right-of-use assets obtained in exchange for lease obligations	706	935
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid for income taxes	7,022	6,310
Cash paid for operating leases	$ 1,340	$ 1,869