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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Jan. 31, 2018
Jan. 31, 2017
Cash flows from operating activities:    
Net income $ 93,588 $ 59,502
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 36,881 34,970
Stock-based compensation expense 15,800 14,101
Provision for doubtful accounts 9,933 8,373
Gain on cash surrender value of life insurance policies (6,020) (3,316)
Gain on marketable securities (14,022) (7,090)
Deferred income taxes 5,373 7,812
Change in other assets and liabilities:    
Deferred compensation 25,587 (22)
Receivables due from clients (62,464) (35,503)
Income tax and other receivables 4,445 (3,249)
Prepaid expenses and other assets (11,867) (8,882)
Investment in unconsolidated subsidiaries (187) (221)
Income taxes payable 18,217 (3,450)
Accounts payable and accrued liabilities (15,569) (45,891)
Other (40,103) (3,393)
Net cash provided by operating activities 59,592 13,741
Cash flows from investing activities:    
Purchase of property and equipment (31,133) (41,616)
Cash paid for acquisition, net of cash acquired   (2,880)
Purchase of marketable securities (7,462) (9,526)
Proceeds from sales/maturities of marketable securities 2,515 42,533
Premium on company-owned life insurance policies (1,339) (1,337)
Proceeds from life insurance policies 5,175  
Dividends received from unconsolidated subsidiaries 60 455
Net cash used in investing activities (32,184) (12,371)
Cash flows from financing activities:    
Proceeds from term loan facility   275,000
Principal payment on term loan facility (15,469) (150,313)
Payment of contingent consideration from acquisition (485) (1,070)
Repurchases of common stock (32,568) (16,318)
Payments of tax withholdings on restricted stock (3,657) (4,377)
Proceeds from issuance of common stock upon exercise of employee stock options and in connection with an employee stock purchase plan 6,885 4,981
Dividends - noncontrolling interest (1,558) (1,229)
Dividends paid to shareholders (17,242) (17,546)
Payments on life insurance policy loans (464)  
Net cash (used in) provided by financing activities (64,558) 89,128
Effect of exchange rate changes on cash and cash equivalents 16,258 (12,445)
Net (decrease) increase in cash and cash equivalents (20,892) 78,053
Cash and cash equivalents at beginning of period 410,882 273,252
Cash and cash equivalents at end of period $ 389,990 $ 351,305