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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Jul. 31, 2013
Jul. 31, 2012
Cash flows from operating activities:    
Net income $ 11,417 $ 10,418
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation and amortization 5,944 3,742
Stock-based compensation expense 2,960 3,196
Provision for doubtful accounts 1,442 1,387
Gain on cash surrender value of life insurance policies (1,291) (671)
(Gain) loss on marketable securities (1,941) 831
Deferred income taxes 3,356 6,852
Change in other assets and liabilities:    
Deferred compensation 1,436 (6,138)
Receivables due from clients (22,111) (12,166)
Income tax and other receivables 2,481 235
Prepaid expenses and other assets (3,977) (1,914)
Investment in unconsolidated subsidiaries (465) (630)
Income taxes payable 2,014 (4,108)
Accounts payable and accrued liabilities (62,800) (74,494)
Other (5,794) (1,070)
Net cash used in operating activities (67,329) (74,530)
Cash flows from investing activities:    
Purchase of property and equipment (5,183) (3,011)
Purchase of marketable securities (20,662) (21,055)
Proceeds from sales/maturities of marketable securities 34,179 19,441
Change in restricted cash 2,861  
Payment of contingent consideration from acquisitions (15,000)  
Premiums on life insurance policies (419) (423)
Dividends received from unconsolidated subsidiaries 510 418
Net cash used in investing activities (3,714) (4,630)
Cash flows from financing activities:    
Purchase of common stock (1,945) (2,499)
Proceeds from issuance of common stock upon exercise of employee stock options and in connection with an employee stock purchase plan 1,822 173
Tax benefit from exercise of stock options 97 (1)
Net cash used in financing activities (26) (2,327)
Effect of exchange rate changes on cash and cash equivalents (2,571) (4,146)
Net decrease in cash and cash equivalents (73,640) (85,633)
Cash and cash equivalents at beginning of period 224,066 282,005
Cash and cash equivalents at end of period $ 150,426 $ 196,372