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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Apr. 30, 2013
Cash flows from operating activities:      
Net income $ 88,357 $ 72,691 $ 33,293
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 27,597 26,172 19,004
Stock-based compensation expense 13,899 12,106 11,906
Provision for doubtful accounts 7,741 7,840 6,748
Gain on cash surrender value of life insurance policies (10,509) (8,242) (6,502)
Gain on marketable securities (8,829) (9,498) (7,556)
Deferred income taxes (316) 7,598 (176)
Change in other assets and liabilities, net of effect of acquisitions:      
Deferred compensation 10,130 12,186 8,477
Receivables due from clients (17,213) (22,318) (16,011)
Income taxes and other receivables 115 896 4,616
Prepaid expenses and other assets (1,145) (1,255) 750
Investment in unconsolidated subsidiaries (2,181) (2,169) (2,110)
Income taxes payable (9,194) 7,533 (3,399)
Accounts payable and accrued liabilities 17,790 29,104 8,494
Other (8,966) (3,162) 4,173
Net cash provided by operating activities 107,276 129,482 61,707
Cash flows from investing activities:      
Purchase of property and equipment (21,860) (28,559) (13,101)
Cash paid for acquisitions, net of cash acquired and earnout (15,296)   (112,064)
Purchase of marketable securities (22,843) (28,150) (50,437)
Proceeds from sales/maturities of marketable securities 21,362 44,475 51,511
Change in restricted cash   2,861 7,222
Payment of contingent consideration from acquisition   (15,000)  
Premium on company-owned life insurance policies (1,676) (1,727) (1,739)
Proceeds from life insurance policies 8,087 388  
Dividends received from unconsolidated subsidiaries 1,656 2,120 1,897
Net cash used in investing activities (30,570) (23,592) (116,711)
Cash flows from financing activities:      
Payments on life insurance policy loans (3,301) (388)  
Purchase of common stock (4,038) (2,249) (2,838)
Proceeds from issuance of common stock upon exercise of employee stock options and in connection with an employee stock purchase plan 2,993 8,805 2,134
Tax benefit from exercise of stock options 1,516 (593) 294
Dividends paid to shareholders (5,105)    
Net cash (used in) provided by financing activities (7,935) 5,575 (410)
Effect of exchange rate changes on cash and cash equivalents (21,650) (1,814) (2,525)
Net increase (decrease) in cash and cash equivalents 47,121 109,651 (57,939)
Cash and cash equivalents at beginning of year 333,717 224,066 282,005
Cash and cash equivalents at end of year 380,838 333,717 224,066
Supplemental cash flow information:      
Cash used to pay interest 4,230 4,229 4,361
Cash used to pay income taxes, net of refunds $ 40,899 $ 15,604 $ 10,611