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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Oct. 31, 2013
Oct. 31, 2012
Cash flows from operating activities:    
Net income $ 30,176 $ 11,614
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation and amortization 12,524 8,039
Stock-based compensation expense 5,792 6,269
Provision for doubtful accounts 3,087 3,145
Gain on cash surrender value of life insurance policies (4,587) (2,178)
Gain on marketable securities (6,369) (1,129)
Deferred income taxes 3,949 5,174
Change in other assets and liabilities, net of effects of acquisition:    
Deferred compensation 7,372 (3,112)
Receivables due from clients (40,826) (23,004)
Income tax and other receivables 2,325 (1,774)
Prepaid expenses and other assets (2,373) (1,697)
Investment in unconsolidated subsidiaries (1,022) (974)
Income taxes payable 3,771 (3,634)
Accounts payable and accrued liabilities (44,928) (40,996)
Other (4,498) 924
Net cash used in operating activities (35,607) (43,333)
Cash flows from investing activities:    
Purchase of property and equipment (11,471) (6,606)
Cash paid for acquisition, net of cash acquired   (34,437)
Purchase of marketable securities (23,299) (32,816)
Proceeds from sales/maturities of marketable securities 38,911 30,763
Change in restricted cash 2,861  
Payment of contingent consideration from acquisition (15,000)  
Premiums on life insurance policies (438) (438)
Dividends received from unconsolidated subsidiaries 510 418
Net cash used in investing activities (7,926) (43,116)
Cash flows from financing activities:    
Purchase of common stock (1,967) (2,643)
Proceeds from issuance of common stock upon exercise of employee stock options and in connection with an employee stock purchase plan 3,854 1,019
Tax benefit from exercise of stock options 137 161
Net cash provided by (used in) financing activities 2,024 (1,463)
Effect of exchange rate changes on cash and cash equivalents 71 (1,177)
Net decrease in cash and cash equivalents (41,438) (89,089)
Cash and cash equivalents at beginning of period 224,066 282,005
Cash and cash equivalents at end of period $ 182,628 $ 192,916