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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Apr. 30, 2014
Apr. 30, 2013
Apr. 30, 2012
Cash flows from operating activities:      
Net income $ 72,691 $ 33,293 $ 54,303
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 26,172 19,004 14,017
Stock-based compensation expense 12,106 11,906 13,399
Provision for doubtful accounts 7,840 6,748 5,732
Gain on cash surrender value of life insurance policies (8,242) (6,502) (6,268)
Gain on marketable securities (9,498) (7,556) (1,013)
Change in fair value of acquisition-related contingent consideration     (2,196)
Deferred income taxes 7,598 (176) 6,512
Change in other assets and liabilities, net of effect of acquisitions:      
Deferred compensation 12,186 8,477 6,320
Receivables due from clients (22,318) (16,011) (4,227)
Income taxes and other receivables 896 4,616 (6,664)
Prepaid expenses and other assets (1,255) 750 2,194
Investment in unconsolidated subsidiaries (2,169) (2,110) (1,850)
Income taxes payable 7,533 (3,399) 4,058
Accounts payable and accrued liabilities 29,104 8,494 (20,519)
Other (3,162) 4,173 7,177
Net cash provided by operating activities 129,482 61,707 70,975
Cash flows from investing activities:      
Purchase of property and equipment (28,559) (13,101) (18,632)
Purchase of intangible assets     (325)
Cash paid for acquisitions, net of cash acquired   (112,064) (442)
Purchase of marketable securities (28,150) (50,437) (55,718)
Proceeds from sales/maturities of marketable securities 44,475 51,511 43,181
Change in restricted cash 2,861 7,222 (221)
Payment of purchase price held back from previous acquisition     (800)
Payment of contingent consideration from acquisition (15,000)    
Premiums on company-owned life insurance policies (1,727) (1,739) (1,739)
Dividends received from unconsolidated subsidiaries 2,120 1,897 1,669
Other 388    
Net cash used in investing activities (23,592) (116,711) (33,027)
Cash flows from financing activities:      
Payments on life insurance policy loans (388)    
Borrowings under life insurance policies     366
Purchase of common stock (2,249) (2,838) (4,215)
Proceeds from issuance of common stock upon exercise of employee stock options and in connection with an employee stock purchase plan 8,805 2,134 4,371
Tax benefit from exercise of stock options (593) 294 1,664
Net cash provided (used in) by financing activities 5,575 (410) 2,186
Effect of exchange rate changes on cash and cash equivalents (1,814) (2,525) (4,985)
Net increase (decrease) in cash and cash equivalents 109,651 (57,939) 35,149
Cash and cash equivalents at beginning of year 224,066 282,005 246,856
Cash and cash equivalents at end of year 333,717 224,066 282,005
Supplemental cash flow information:      
Cash used to pay interest 4,229 4,361 4,480
Cash used to pay income taxes $ 15,604 $ 10,611 $ 17,916