CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jul. 31, 2019	Jul. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES
Net (loss) income	$ (28,933)	$ 21,786
Adjustments to reconcile net (loss) income to net cash used in operating activities
Deferred income tax (benefit) expense	(6,722)	924
Impairment loss	2,072
Depreciation	1,711	1,567
Stock compensation expense	926	906
Amortization of purchased intangible assets	592	506
Gain on the settlement of litigation		(1,400)
Other	650	(380)
Changes in operating assets and liabilities
Accounts receivable	(9,835)	(19,946)
Contract assets	6,615	(20,945)
Other assets	2,722	337
Accounts payable and accrued expenses	(16,371)	(18,659)
Contract liabilities	(6,591)	(23,228)
Net cash used in operating activities	(53,164)	(58,532)
CASH FLOWS FROM INVESTING ACTIVITIES
Maturities of short-term investments	104,000	206,500
Purchases of short-term investments	(35,000)	(91,000)
Purchases of property, plant and equipment	(3,043)	(5,365)
Changes in notes receivable		225
Net cash provided by investing activities	65,957	110,360
CASH FLOWS FROM FINANCING ACTIVITIES
Cash dividends paid	(7,803)	(7,784)
Proceeds from the exercise of stock options	1,567	14
Net cash used in financing activities	(6,236)	(7,770)
EFFECTS OF EXCHANGE RATE CHANGES ON CASH	(165)	(399)
NET INCREASE IN CASH AND CASH EQUIVALENTS	6,392	43,659
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	164,318	122,107
CASH AND CASH EQUIVALENTS, END OF PERIOD	170,710	165,766
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid for income taxes	2,982	2,333
Cash paid for interest		$ 659
Cash received from income tax refunds	7,917
Operating lease payments made (Note 7)	287
Adoption of ASC Topic 842 (non-cash transaction, see Note 7)	$ 1,341