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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Cash flows from operating activities:    
Net income $ 59,502 $ 25,058
Adjustments to reconcile net income to net cash provided (used) in operating activities:    
Depreciation and amortization 34,970 24,933
Stock-based compensation expense 14,101 13,539
Provision for doubtful accounts 8,373 6,656
Gain on cash surrender value of life insurance policies (3,316) (1,801)
(Gain) loss on marketable securities (7,090) 8,904
Deferred income taxes 7,812 3,059
Change in other assets and liabilities:    
Deferred compensation (22) (3,714)
Receivables due from clients (35,503) (32,291)
Income tax and other receivables (3,249) (11,038)
Prepaid expenses and other assets (8,882) (6,560)
Investment in unconsolidated subsidiaries (221) (1,446)
Income taxes payable (3,500) (4,243)
Accounts payable and accrued liabilities (45,891) (29,184)
Other (3,393) (9,243)
Net cash provided by (used in) operating activities 13,691 (17,371)
Cash flows from investing activities:    
Purchase of property and equipment (41,616) (17,673)
Cash paid for acquisition, net of cash acquired (2,880) (252,568)
Purchase of marketable securities (9,526) (30,276)
Proceeds from sales/maturities of marketable securities 42,533 29,837
Premium on company-owned life insurance policies (1,337) (1,352)
Proceeds from life insurance policies   2,553
Dividends received from unconsolidated subsidiaries 455 2,130
Net cash used in investing activities (12,371) (267,349)
Cash flows from financing activities:    
Proceeds from term loan facility 275,000 150,000
Principal payment on term loan facility (150,313) (2,500)
Payment of contingent consideration from acquisition (1,070)  
Repurchases of common stock (16,318)  
Payments of tax withholdings on restricted stock (4,377) (6,709)
Proceeds from issuance of common stock upon exercise of employee stock options and in connection with an employee stock purchase plan 4,981 3,972
Tax benefit related to stock-based compensation 50 4,730
Dividends - noncontrolling interest (1,229)  
Dividends paid to shareholders (17,546) (16,059)
Payments on life insurance policy loans   (1,251)
Net cash provided by financing activities 89,178 132,183
Effect of exchange rate changes on cash and cash equivalents (12,445) (20,959)
Net increase (decrease) in cash and cash equivalents 78,053 (173,496)
Cash and cash equivalents at beginning of period 273,252 380,838
Cash and cash equivalents at end of period $ 351,305 $ 207,342