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Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Oct. 31, 2011
Oct. 31, 2010
Cash flows from operating activities:    
Net income $ 30,558 $ 24,560
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation and amortization 6,844 6,112
Stock-based compensation expense 6,597 7,806
(Gain) loss on disposition of property and equipment (103) 82
Provision for doubtful accounts 3,969 4,274
Gain on cash surrender value of life insurance policies (1,175) (2,982)
Loss (gain) on marketable securities classified as trading 4,116 (1,832)
Change in fair value of acquisition-related contingent consideration (2,196) (1,878)
Deferred income taxes 1,531 5,685
Change in other assets and liabilities:    
Deferred compensation (3,674) 7,215
Receivables (20,374) (44,286)
Prepaid expenses (1,917) (4,774)
Investment in unconsolidated subsidiaries (979) (974)
Income taxes payable 2,145 2,165
Accounts payable and accrued liabilities (61,489) (7,723)
Other 927 (1,141)
Net cash used in operating activities (35,220) (7,691)
Cash flows from investing activities:    
Purchase of property and equipment (8,763) (17,263)
Purchase of marketable securities (30,846) (51,890)
Proceeds from sales/maturities of marketable securities 22,850 17,383
Payment of purchase price held back from previous acquisition (800)  
Payment of contingent consideration from acquisitions   (1,995)
Premiums on life insurance policies (435) (363)
Proceeds from sales of property and equipment 125  
Dividends received from unconsolidated subsidiaries 140 591
Net cash used in investing activities (17,729) (53,537)
Cash flows from financing activities:    
Borrowings under life insurance policies 362 489
Purchase of common stock (4,098) (13,390)
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 3,131 2,005
Tax benefit (expense) from exercise of stock options 1,617 (226)
Net cash provided by (used in) financing activities 1,012 (8,139)
Effect of exchange rate changes on cash and cash equivalents (2,750) 1,252
Net decrease in cash and cash equivalents (54,687) (68,115)
Cash and cash equivalents at beginning of period 246,856 219,233
Cash and cash equivalents at end of period $ 192,169 $ 151,118