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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