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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Jul. 31, 2012
Jul. 31, 2011
Cash flows from operating activities:    
Net income $ 10,418 $ 15,411
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation and amortization 3,742 3,369
Stock-based compensation expense 3,196 3,170
Provision for doubtful accounts 1,387 1,957
Gain on cash surrender value of life insurance policies (671) (905)
Loss on marketable securities classified as trading 831 1,625
Deferred income taxes 6,852 1,374
Change in other assets and liabilities:    
Deferred compensation (6,138) (1,669)
Receivables due from clients (12,166) (25,348)
Income tax and other receivables 235 391
Prepaid expenses and other assets (1,914) (2,825)
Investment in unconsolidated subsidiaries (630) (507)
Income taxes payable (4,108) (270)
Accounts payable and accrued liabilities (74,494) (75,901)
Other (1,070) (2,855)
Net cash used in operating activities (74,530) (82,983)
Cash flows from investing activities:    
Purchase of property and equipment (3,011) (5,207)
Purchase of marketable securities (21,055) (22,528)
Proceeds from sales/maturities of marketable securities 19,441 18,879
Premiums on life insurance policies (423) (417)
Dividends received from unconsolidated subsidiaries 418 140
Net cash used in investing activities (4,630) (9,133)
Cash flows from financing activities:    
Borrowings under life insurance policies   359
Purchase of common stock (2,499) (4,014)
Proceeds from issuance of common stock upon exercise of employee stock options and in connection with an employee stock purchase plan 173 3,109
Tax benefit from exercise of stock options (1) 1,650
Net cash (used in) provided by financing activities (2,327) 1,104
Effect of exchange rate changes on cash and cash equivalents (4,146) 1,093
Net decrease in cash and cash equivalents (85,633) (89,919)
Cash and cash equivalents at beginning of period 282,005 246,856
Cash and cash equivalents at end of period $ 196,372 $ 156,937