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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Oct. 31, 2016
Oct. 31, 2015
Cash flows from operating activities:    
Net income $ 35,124 $ 41,053
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation and amortization 23,196 14,603
Stock-based compensation expense 9,520 9,013
Provision for doubtful accounts 5,151 4,389
Gain on cash surrender value of life insurance policies (3,172) (3,295)
(Gain) loss on marketable securities (3,226) 1,818
Deferred income taxes 5,833 6,816
Change in other assets and liabilities:    
Deferred compensation (6,804) (1,324)
Receivables due from clients (49,964) (46,288)
Income tax and other receivables (2,876) (9,492)
Prepaid expenses and other assets (8,184) (7,450)
Investment in unconsolidated subsidiaries (108) (1,265)
Income taxes payable (5,980) 1,273
Accounts payable and accrued liabilities (85,133) (69,087)
Other (2,009) (14,205)
Net cash used in operating activities (88,632) (73,441)
Cash flows from investing activities:    
Purchase of property and equipment (32,322) (10,645)
Cash paid for acquisition, net of cash acquired (2,880)  
Purchase of marketable securities (9,526) (29,010)
Proceeds from sales/maturities of marketable securities 14,139 24,760
Premium on company-owned life insurance policies (420) (419)
Proceeds from life insurance policies   1,659
Dividends received from unconsolidated subsidiaries 230 806
Net cash used in investing activities (30,779) (12,849)
Cash flows from financing activities:    
Proceeds from term loan facility 275,000  
Principal payment on term loan facility (145,156)  
Payment of contingent consideration from acquisition (1,070)  
Repurchases of common stock - repurchased program (6,940)  
Payments of tax withholdings on restricted stock (4,177) (6,596)
Proceeds from issuance of common stock upon exercise of employee stock options and in connection with an employee stock purchase plan 2,614 2,491
Tax benefit related to stock-based compensation 33 4,656
Dividends paid to shareholders (11,750) (10,289)
Payments on life insurance policy loans   (1,151)
Net cash provided by (used in) financing activities 108,554 (10,889)
Effect of exchange rate changes on cash and cash equivalents (12,362) (12,916)
Net decrease in cash and cash equivalents (23,219) (110,095)
Cash and cash equivalents at beginning of period 273,252 380,838
Cash and cash equivalents at end of period $ 250,033 $ 270,743