CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Oct. 31, 2017	Oct. 31, 2016
Cash flows from operating activities:
Net income	$ 66,161	$ 35,124
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization	24,656	23,196
Stock-based compensation expense	10,283	9,520
Provision for doubtful accounts	6,960	5,151
Gain on cash surrender value of life insurance policies	(4,227)	(3,172)
Gain on marketable securities	(6,797)	(3,226)
Deferred income taxes	7,802	5,833
Change in other assets and liabilities:
Deferred compensation	12,560	(6,804)
Receivables due from clients	(59,020)	(49,964)
Income tax and other receivables	(7,207)	(2,876)
Prepaid expenses and other assets	(15,267)	(8,184)
Investment in unconsolidated subsidiaries	(90)	(108)
Income taxes payable	9,459	(5,947)
Accounts payable and accrued liabilities	(66,089)	(85,133)
Other	(35,344)	(2,009)
Net cash used in operating activities	(56,160)	(88,599)
Cash flows from investing activities:
Purchase of property and equipment	(20,813)	(32,322)
Cash paid for acquisition, net of cash acquired		(2,880)
Purchase of marketable securities	(6,738)	(9,526)
Proceeds from sales/maturities of marketable securities	2,273	14,139
Premium on company-owned life insurance policies	(422)	(420)
Proceeds from life insurance policies	971
Dividends received from unconsolidated subsidiaries	60	230
Net cash used in investing activities	(24,669)	(30,779)
Cash flows from financing activities:
Proceeds from term loan facility		275,000
Principal payment on term loan facility	(10,313)	(145,156)
Payment of contingent consideration from acquisition	(485)	(1,070)
Repurchases of common stock	(29,261)	(6,940)
Payments of tax withholdings on restricted stock	(3,461)	(4,177)
Proceeds from issuance of common stock upon exercise of employee stock options and in connection with an employee stock purchase plan	3,984	2,614
Dividends - noncontrolling interest	(1,558)
Dividends paid to shareholders	(11,537)	(11,750)
Payments on life insurance policy loans	(414)
Net cash (used in) provided by financing activities	(53,045)	108,521
Effect of exchange rate changes on cash and cash equivalents	5,617	(12,362)
Net decrease in cash and cash equivalents	(128,257)	(23,219)
Cash and cash equivalents at beginning of period	410,882	273,252
Cash and cash equivalents at end of period	$ 282,625	$ 250,033