CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2022	Oct. 31, 2021	Oct. 31, 2022	Oct. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 7,758	$ 12,393	$ 19,465	$ 36,029
Adjustments to reconcile net income to net cash (used in) provided by operating activities
Stock compensation expense	1,100	900	3,055	2,521
Depreciation	740	819	2,296	2,560
Lease expense	600	1,100	1,871	3,017
Equity in (income) loss of solar energy investments			(1,112)	404
Amortization of purchased intangible assets	212	227	611	680
Deferred income tax (benefit) expense			(209)	383
Other			(770)	(14)
Changes in operating assets and liabilities
Accounts receivable			(10,921)	(7,084)
Contract assets			(6,647)	16,727
Other assets			6,184	2,070
Accounts payable and accrued expenses			(7,952)	(19,966)
Contract liabilities			(78,859)	4,372
Net cash (used in) provided by operating activities			(72,988)	41,699
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of short-term investments			(249,750)	(90,000)
Maturities of short-term investments			190,000	90,000
Purchases of property, plant and equipment			(2,582)	(1,123)
Investments in solar energy projects				(4,085)
Net cash used in investing activities			(62,332)	(5,208)
CASH FLOWS FROM FINANCING ACTIVITIES
Common stock repurchases			(63,252)
Payments of cash dividends			(10,588)	(11,831)
Proceeds from the exercise of stock options			66	1,396
Net cash used in financing activities			(73,774)	(10,435)
EFFECTS OF EXCHANGE RATE CHANGES ON CASH			(5,313)	(1,164)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS			(214,407)	24,892
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD			350,472	366,671
CASH AND CASH EQUIVALENTS, END OF PERIOD	$ 136,065	$ 391,563	$ 136,065	$ 391,563