CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2020	Apr. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES
Net loss	$ (793)	$ (29,913)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities
Deferred income tax expense	8,214	259
Impairment loss		2,072
Depreciation	937	829
Stock compensation expense	642	413
Change in accrued interest on short-term investments	(118)	(163)
Amortization of purchased intangible assets	225	299
Other	446	188
Changes in operating assets and liabilities
Accounts receivable	14,980	(12,049)
Contract assets	344	9,821
Other assets	(13,600)	3,808
Accounts payable and accrued expenses	(8,230)	(10,497)
Contract liabilities	37,140	(1,449)
Net cash provided by (used in) operating activities	40,187	(36,382)
CASH FLOWS FROM INVESTING ACTIVITIES
Maturities of short-term investments	70,000	44,000
Purchases of short-term investments	(10,000)	(35,000)
Purchases of property, plant and equipment	(684)	(1,985)
Net cash provided by investing activities	59,316	7,015
CASH FLOWS FROM FINANCING ACTIVITIES
Payments of cash dividends	(3,910)	(3,895)
Proceeds from the exercise of stock options	177	1,567
Net cash used in financing activities	(3,733)	(2,328)
EFFECTS OF EXCHANGE RATE CHANGES ON CASH	(206)	(235)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	95,564	(31,930)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	167,363	164,318
CASH AND CASH EQUIVALENTS, END OF PERIOD	$ 262,927	$ 132,388