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Consolidated Statements Of Cash Flows (USD $)
In Thousands
 3 Months Ended
Jul. 31, 2011
Jul. 31, 2010
Cash flows from operating activities:    
Net income $ 15,411 $ 10,904
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation and amortization 3,369 2,968
Stock-based compensation expense 3,170 3,815
Loss on disposition of property and equipment 12 60
Provision for doubtful accounts 1,957 1,826
Gain on cash surrender value of life insurance policies (1,033) (207)
Loss on marketable securities classified as trading 1,625 1,420
Deferred income taxes 1,374 6,939
Change in other assets and liabilities:    
Deferred compensation (1,915) 3,976
Receivables (24,957) (25,291)
Prepaid expenses (2,697) (4,417)
Investment in unconsolidated subsidiaries (507) (462)
Income taxes payable (270) (1,024)
Accounts payable and accrued liabilities (75,655) (41,164)
Other (2,867) (139)
Net cash used in operating activities (82,983) (40,796)
Cash flows from investing activities:    
Purchase of property and equipment (5,207) (11,684)
Purchase of marketable securities (22,528) (24,493)
Proceeds from sales/maturities of marketable securities 18,879 14,092
Payment of contingent consideration from acquisitions   (675)
Premiums on life insurance policies (417) (350)
Dividends received from unconsolidated subsidiaries 140 252
Net cash used in investing activities (9,133) (22,858)
Cash flows from financing activities:    
Borrowings under life insurance policies 359 347
Purchase of common stock (4,014) (11,124)
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 3,109 1,493
Tax benefit (expense) from exercise of stock options 1,650 (815)
Net cash provided (used) in financing activities 1,104 (7,116)
Effect of exchange rate changes on cash and cash equivalents 1,093 (2,447)
Net decrease in cash and cash equivalents (89,919) (73,217)
Cash and cash equivalents at beginning of period 246,856 219,233
Cash and cash equivalents at end of period $ 156,937 $ 146,016