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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Oct. 31, 2018
Oct. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income $ 54,160 $ 65,296
Adjustments to reconcile net income to net cash used in operating activities    
Depreciation 2,465 1,936
Gain on the settlement of litigation (Note 9) (1,400)  
Stock compensation expense 1,244 3,573
Change in accrued interest on short-term investments 912 (677)
Amortization of purchased intangible assets 759 776
Deferred income tax (benefit) expense (153) 475
Other 120 360
Changes in operating assets and liabilities    
Accounts receivable (17,686) (2,729)
Other assets 15,895 2,720
Accounts payable and accrued expenses (44,016) 5,600
Changes in contracts-in-progress, net (Note 4) (79,616) (94,629)
Net cash used in operating activities (99,106) (22,739)
CASH FLOWS FROM INVESTING ACTIVITIES    
Purchases of short-term investments (158,000) (462,500)
Maturities of short-term investments 310,000 485,000
Purchases of property, plant and equipment (7,366) (4,006)
Changes in notes receivable 225 (200)
Net cash provided by investing activities 144,859 18,294
CASH FLOWS FROM FINANCING ACTIVITIES    
Cash dividends paid (11,677) (15,548)
Proceeds from the exercise of stock options 48 2,781
Distributions to joint venture partners (72) (1,229)
Net cash used in financing activities (11,701) (13,996)
EFFECTS OF EXCHANGE RATE CHANGES ON CASH (368) 951
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 33,684 (17,490)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 122,107 167,198
CASH AND CASH EQUIVALENTS, END OF PERIOD 155,791 149,708
SUPPLEMENTAL CASH FLOW INFORMATION    
Cash paid for income taxes 2,625 $ 36,922
Cash paid for interest $ 659