CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2022	Apr. 30, 2021
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 7,485	$ 10,766
Adjustments to reconcile net income to net cash (used in) provided by operating activities
Stock compensation expense	920	679
Depreciation	809	882
Lease expense	750	776
Deferred income tax expense	450	599
Amortization of purchased intangible assets	166	228
Other	(822)	(114)
Changes in operating assets and liabilities
Accounts receivable	(9,069)	(3,666)
Contract assets	(1,976)	477
Other assets	(2,291)	765
Accounts payable and accrued expenses	(15,229)	(21,552)
Contract liabilities	(20,923)	27,506
Net cash (used in) provided by operating activities	(39,730)	17,346
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of short-term investments	(175,000)
Investment in solar energy projects		(3,520)
Net cash (used in) provided by investing activities	(85,238)	15,636
CASH FLOWS FROM FINANCING ACTIVITIES
Common stock repurchases	(27,077)
Payments of cash dividends	(3,712)	(3,942)
Proceeds from the exercise of stock options	66	1,023
Net cash used in financing activities	(30,723)	(2,919)
EFFECTS OF EXCHANGE RATE CHANGES ON CASH	(2,526)	(59)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(158,217)	30,004
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	350,472	366,671
CASH AND CASH EQUIVALENTS, END OF PERIOD	$ 192,255	$ 396,675