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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified | 9 Months Ended
--- | ---
Jan. 31, 2013 | Jan. 31, 2012
Cash flows from operating activities: |  |
Net income | $ 21,096 | $ 42,275
Adjustments to reconcile net income to net cash used in operating activities: |  |
Depreciation and amortization | 13,127 | 10,367
Stock-based compensation expense | 8,820 | 9,913
Provision for doubtful accounts | 4,818 | 5,541
Gain on cash surrender value of life insurance policies | (4,236) | (3,256)
(Gain) loss on marketable securities | (4,927) | 1,954
Change in fair value of acquisition-related contingent consideration |  | (2,196)
Deferred income taxes | 8,900 | 13,537
Change in other assets and liabilities, net of effects of acquisition: |  |
Deferred compensation | 1,242 | (1,202)
Receivables due from clients | (17,443) | (13,547)
Income tax and other receivables | (6,806) | (12,331)
Prepaid expenses and other assets | (1,035) | 2,346
Investment in unconsolidated subsidiaries | (1,567) | (1,272)
Income taxes payable | (3,309) | 2,671
Accounts payable and accrued liabilities | (22,461) | (55,926)
Other | 1,576 | 5,049
Net cash (used) provided in operating activities | (2,205) | 3,923
Cash flows from investing activities: |  |
Purchase of property and equipment | (9,382) | (13,484)
Purchase of intangible assets |  | (325)
Cash paid for acquisitions, net of cash acquired and earn-outs | (112,064) |
Purchase of marketable securities | (44,259) | (49,494)
Proceeds from sales/maturities of marketable securities | 47,778 | 35,466
Payment of purchase price held back from previous acquisition |  | (800)
Change in restricted cash | 7,222 |
Premiums on life insurance policies | (1,450) | (1,446)
Dividends received from unconsolidated subsidiaries | 1,897 | 1,669
Net cash used in investing activities | (110,258) | (28,414)
Cash flows from financing activities: |  |
Borrowings under life insurance policies |  | 364
Purchase of common stock | (2,673) | (4,117)
Proceeds from issuance of common stock upon exercise of employee stock options and in connection with an employee stock purchase plan | 1,343 | 3,399
Tax benefit from exercise of stock options | 203 | 1,676
Net cash (used) provided by financing activities | (1,127) | 1,322
Effect of exchange rate changes on cash and cash equivalents | (180) | (5,491)
Net decrease in cash and cash equivalents | (113,770) | (28,660)
Cash and cash equivalents at beginning of period | 282,005 | 246,856
Cash and cash equivalents at end of period | $ 168,235 | $ 218,196

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- Definition The cash outflow from purchases of trading, available-for-sale securities and held-to-maturity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 17 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3213-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 17 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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