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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified | 6 Months Ended
--- | ---
Oct. 31, 2012 | Oct. 31, 2011
Cash flows from operating activities: |  |
Net income | $ 11,614 | $ 30,558
Adjustments to reconcile net income to net cash used in operating activities: |  |
Depreciation and amortization | 8,039 | 6,844
Stock-based compensation expense | 6,269 | 6,597
Provision for doubtful accounts | 3,145 | 3,969
Gain on cash surrender value of life insurance policies | (2,178) | (1,047)
(Gain) loss on marketable securities classified as trading | (1,129) | 4,116
Change in fair value of acquisition-related contingent consideration |  | (2,196)
Deferred income taxes | 5,174 | 1,531
Change in other assets and liabilities, net of effects of acquisition: |  |
Deferred compensation | (3,112) | (3,212)
Receivables due from clients | (23,004) | (19,612)
Income tax and other receivables | (1,774) | (762)
Prepaid expenses and other assets | (1,697) | (2,045)
Investment in unconsolidated subsidiaries | (974) | (979)
Income taxes payable | (3,634) | 2,145
Accounts payable and accrued liabilities | (40,996) | (61,951)
Other | 924 | 824
Net cash used in operating activities | (43,333) | (35,220)
Cash flows from investing activities: |  |
Purchase of property and equipment | (6,606) | (8,638)
Cash paid for acquisition, net of cash acquired | (34,437) |
Purchase of marketable securities | (32,816) | (30,846)
Proceeds from sales/maturities of marketable securities | 30,763 | 22,850
Payment of purchase price held back from previous acquisition |  | (800)
Premiums on life insurance policies | (438) | (435)
Dividends received from unconsolidated subsidiaries | 418 | 140
Net cash used in investing activities | (43,116) | (17,729)
Cash flows from financing activities: |  |
Borrowings under life insurance policies |  | 362
Purchase of common stock | (2,643) | (4,098)
Proceeds from issuance of common stock upon exercise of employee stock options and in connection with an employee stock purchase plan | 1,019 | 3,131
Tax benefit from exercise of stock options | 161 | 1,617
Net cash (used in) provided by financing activities | (1,463) | 1,012
Effect of exchange rate changes on cash and cash equivalents | (1,177) | (2,750)
Net decrease in cash and cash equivalents | (89,089) | (54,687)
Cash and cash equivalents at beginning of period | 282,005 | 246,856
Cash and cash equivalents at end of period | $ 192,916 | $ 192,169

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- Definition The cash inflow from amounts received from issuance of long-term debt that is wholly or partially secured by collateral. Excludes proceeds from tax exempt secured debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 19 -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3255-108585 + Details
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