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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jul. 31, 2018 | Jul. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES |  |
Net income | $ 21,786 | $ 48,067
Adjustments to reconcile net income to net cash (used in) provided by operating activities |  |
Depreciation | 1,567 | 1,210
Gain on the settlement of litigation (Note 9) | (1,400) |
Deferred income tax expense (benefit) | 924 | (153)
Stock compensation expense | 906 | 2,315
Amortization of purchased intangible assets | 506 | 518
Change in accrued interest on short-term investments | 432 | (629)
Provision for uncollectible accounts | (135) | 345
Other | (677) | 206
Changes in operating assets and liabilities |  |
Accounts receivable | (19,946) | 2,999
Prepaid expenses and other assets | 337 | 2,600
Accounts payable and accrued expenses | (18,659) | 21,485
Changes in contracts in progress, net (Note 4) | (44,173) | (44,387)
Net cash (used in) provided by operating activities | (58,532) | 34,576
CASH FLOWS FROM INVESTING ACTIVITIES |  |
Purchases of short-term investments | (91,000) | (357,500)
Maturities of short-term investments | 206,500 | 310,000
Purchases of property, plant and equipment | (5,365) | (2,802)
Change in notes receivable | 225 | (200)
Net cash provided by (used in) investing activities | 110,360 | (50,502)
CASH FLOWS FROM FINANCING ACTIVITIES |  |
Cash dividends paid | (7,784) |
Proceeds from the exercise of stock options | 14 | 2,453
Distributions to joint venture partners |  | (1,229)
Net cash (used in) provided by financing activities | (7,770) | 1,224
EFFECTS OF EXCHANGE RATE CHANGES ON CASH | (399) | 729
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS | 43,659 | (13,973)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD | 122,107 | 167,198
CASH AND CASH EQUIVALENTS, END OF PERIOD | 165,766 | 153,225
SUPPLEMENTAL CASH FLOW INFORMATION |  |
Cash paid for income taxes | 2,333 | $ 19,754
Cash paid for interest | $ 659 |

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- Definition Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130534-203044 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.5) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130543-203045 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- References No definition available. + Details
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