CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ 35,706	$ 23,811	$ (40,712)
Adjustments to reconcile net income (loss) to net cash provided by operating activities
Impairment loss	7,901		4,895
Stock compensation expense	3,459	2,938	2,131
Lease expense	3,391	1,820	1,004
Provisions for credit losses	2,381	16	20
Depreciation	3,367	3,715	3,513
Amortization of purchased intangible assets	870	904	1,136
Deferred income tax (benefit) expense	(208)	7,645	(6,640)
Other	424	625	869
Changes in operating assets and liabilities
Accounts receivable	(480)	8,463	(1,038)
Contract assets	21,741	6,744	24,978
Other assets	(241)	(11,467)	2,357
Accounts payable and accrued expenses	(5,742)	31,442	(3,284)
Contract liabilities	(44,154)	99,357	64,336
Net cash provided by operating activities	28,415	176,013	53,565
CASH FLOWS FROM INVESTING ACTIVITIES
Maturities of short-term investments	90,000	170,000	166,000
Purchases of short-term investments	(90,000)	(100,000)	(195,000)
Investment in solar energy projects	(5,016)	(1,333)
Purchases of property, plant and equipment	(1,422)	(1,697)	(7,058)
Acquisition of Lee Telecom, Inc.	(600)
Net cash (used in) provided by investing activities	(7,038)	66,970	(36,058)
CASH FLOWS FROM FINANCING ACTIVITIES
Payments of cash dividends	(15,664)	(47,047)	(15,621)
Common stock repurchases	(20,372)
Proceeds from the exercise of stock options	1,428	1,641	1,630
Net cash used in financing activities	(34,608)	(45,406)	(13,991)
EFFECTS OF EXCHANGE RATE CHANGES ON CASH	(2,968)	1,731	(471)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(16,199)	199,308	3,045
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	366,671	167,363	164,318
CASH AND CASH EQUIVALENTS, END OF PERIOD	$ 350,472	$ 366,671	$ 167,363