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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Apr. 30, 2012
Apr. 30, 2011
Apr. 30, 2010
Cash flows from operating activities:      
Net income $ 54,303 $ 58,874 $ 5,298
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Depreciation and amortization 14,017 12,671 11,493
Stock-based compensation expense 13,399 15,547 17,729
Impairment of intangible assets   880  
(Gain) loss on disposition of property and equipment (65) 80 323
Provision for doubtful accounts 5,732 7,650 3,340
Gain on cash surrender value of life insurance policies (6,268) (7,218) (9,424)
Gain on marketable securities classified as trading (1,013) (7,599) (11,137)
Change in fair value of acquisition-related contingent consideration (2,196) (4,919)  
Deferred income taxes 6,512 5,954 (20,862)
Change in other assets and liabilities:      
Deferred compensation 3,787 11,716 15,828
Receivables, including income tax and other receivables (10,891) (28,140) (33,516)
Prepaid expenses and other assets 2,194 (6,172) (4,520)
Investment in unconsolidated subsidiaries (1,850) (1,862) (91)
Income taxes payable 4,058 (1,686) 2,844
Accounts payable and accrued liabilities (17,986) 40,757 (595)
Other 7,242 (899) (7,556)
Net cash provided by (used in) operating activities 70,975 95,634 (30,846)
Cash flows from investing activities:      
Purchase of property and equipment (18,632) (27,889) (7,282)
Purchase of intangible assets (325)   (3,481)
Purchase of marketable securities (55,718) (65,964) (4,163)
Proceeds from sales/maturities of marketable securities 43,181 28,618 13,374
Change in restricted cash (221) (10,007)  
Payment of purchase price held back from previous acquisition (800)    
Cash paid for acquisitions, net of cash acquired and contingent consideration (442)   (18,734)
Payment of contingent consideration from acquisitions   (5,795) (2,405)
Premiums on life insurance policies (1,739) (1,702) (1,711)
Dividends received from unconsolidated subsidiaries 1,669 1,608 958
Net cash used in investing activities (33,027) (81,131) (23,444)
Cash flows from financing activities:      
Payments on life insurance policy loans     (183)
Borrowings under life insurance policies 366 6,039 5,500
Purchase of common stock (4,215) (13,844) (3,136)
Proceeds from exercise of warrants   2,983  
Proceeds from issuance of common stock upon exercise of employee stock options and in connection with an employee stock purchase plan 4,371 10,084 6,526
Tax benefit (expense) from exercise of stock options 1,664 1,287 (611)
Payment of dividends by majority owned consolidated subsidiaries   (600)  
Net cash provided by financing activities 2,186 5,949 8,096
Effect of exchange rate changes on cash and cash equivalents (4,985) 7,171 10,427
Net increase (decrease) in cash and cash equivalents 35,149 27,623 (35,767)
Cash and cash equivalents at beginning of year 246,856 219,233 255,000
Cash and cash equivalents at end of year 282,005 246,856 219,233
Supplemental cash flow information:      
Cash used to pay interest 4,480 4,834 3,992
Cash used to pay income taxes $ 17,916 $ 25,329 $ 8,111