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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Jan. 31, 2016
Jan. 31, 2015
Cash flows from operating activities:    
Net income $ 25,058 $ 62,875
Adjustments to reconcile net income to net cash (used in) provided by operating activities:    
Depreciation and amortization 24,933 20,363
Stock-based compensation expense 13,539 10,378
Provision for doubtful accounts 6,656 5,644
Gain on cash surrender value of life insurance policies (1,801) (8,498)
Loss (gain) on marketable securities 8,904 (4,328)
Deferred income taxes 3,059 1,049
Change in other assets and liabilities:    
Deferred compensation (3,714) 2,846
Receivables due from clients (32,291) (31,144)
Income tax and other receivables (11,038) 1,066
Prepaid expenses and other assets (6,560) (1,340)
Investment in unconsolidated subsidiaries (1,446) (1,696)
Income taxes payable (4,243) (4,999)
Accounts payable and accrued liabilities (29,184) (26,899)
Other (9,243) (7,232)
Net cash (used in) provided by operating activities (17,371) 18,085
Cash flows from investing activities:    
Cash paid for acquisition, net of cash acquired (252,568)  
Purchase of property and equipment (17,673) (15,605)
Purchase of marketable securities (30,276) (22,752)
Proceeds from sales/maturities of marketable securities 29,837 12,533
Premiums on company-owned life insurance policies (1,352) (1,385)
Proceeds from life insurance policies 2,553 8,087
Dividends received from unconsolidated subsidiaries 2,130 1,656
Net cash used in investing activities (267,349) (17,466)
Cash flows from financing activities:    
Proceeds from term loan facility 150,000  
Principal payment on term loan facility (2,500)  
Purchase of common stock (6,709) (3,842)
Proceeds from issuance of common stock upon exercise of employee stock options and in connection with an employee stock purchase plan 3,972 2,177
Tax benefit related to stock-based compensation 4,730 1,386
Dividends paid to shareholders (16,059)  
Payments on life insurance policy loans (1,251) (3,301)
Net cash provided by (used in) financing activities 132,183 (3,580)
Effect of exchange rate changes on cash and cash equivalents (20,959) (26,305)
Net decrease in cash and cash equivalents (173,496) (29,266)
Cash and cash equivalents at beginning of period 380,838 333,717
Cash and cash equivalents at end of period $ 207,342 $ 304,451