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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Oct. 31, 2014
Oct. 31, 2013
Cash flows from operating activities:    
Net income $ 39,936 $ 30,176
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation and amortization 13,549 12,524
Stock-based compensation expense 6,959 5,792
Provision for doubtful accounts 3,770 3,087
Gain on cash surrender value of life insurance policies (5,494) (4,587)
Gain on marketable securities (4,527) (6,369)
Deferred income taxes 2,644 3,949
Change in other assets and liabilities:    
Deferred compensation 5,570 7,372
Receivables due from clients (39,502) (40,826)
Income tax and other receivables (5,938) 2,325
Prepaid expenses and other assets (2,538) (2,373)
Investment in unconsolidated subsidiaries (918) (1,022)
Income taxes payable (4,773) 3,771
Accounts payable and accrued liabilities (56,259) (44,928)
Other (4,494) (4,498)
Net cash used in operating activities (52,015) (35,607)
Cash flows from investing activities:    
Purchase of property and equipment (11,305) (11,471)
Purchase of marketable securities (22,141) (23,299)
Proceeds from sales/maturities of marketable securities 9,232 38,911
Change in restricted cash   2,861
Payment of contingent consideration from acquisition   (15,000)
Premiums on company-owned life insurance policies (447) (438)
Proceeds from life insurance policies 1,976  
Dividends received from unconsolidated subsidiaries 318 510
Net cash used in investing activities (22,367) (7,926)
Cash flows from financing activities:    
Purchase of common stock (3,748) (1,967)
Proceeds from issuance of common stock upon exercise of employee stock options and in connection with an employee stock purchase plan 1,884 3,854
Tax benefit from exercise of stock options 1,350 137
Payments on life insurance policy loans (705)  
Net cash (used in) provided by financing activities (1,219) 2,024
Effect of exchange rate changes on cash and cash equivalents (9,926) 71
Net decrease in cash and cash equivalents (85,527) (41,438)
Cash and cash equivalents at beginning of period 333,717 224,066
Cash and cash equivalents at end of period $ 248,190 $ 182,628