CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2019
Cash flows from operating activities:
Net income	$ 115,562	$ 107,017	$ 104,796
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	61,845	55,311	46,489
Stock-based compensation expense	27,157	22,818	23,385
Tradename write-offs			106,555
Write-off of long-lived assets		2,654
Provision for doubtful accounts	15,763	14,644	14,260
Gain on cash surrender value of life insurance policies	(13,017)	(6,551)	(6,160)
(Gain) loss on marketable securities	(38,529)	2,066	(8,134)
Deferred income taxes	(14,140)	(9,330)	(27,796)
Change in other assets and liabilities:
Deferred compensation	64,005	23,496	18,478
Receivables due from clients	(67,331)	34,152	(30,625)
Income taxes and other receivables	5,798	(6,421)	1,409
Prepaid expenses and other assets	(3,902)	(956)	(148)
Unearned compensation	(32,935)	300	(7,299)
Income taxes payable	(1,824)	1,246	213
Accounts payable and accrued liabilities	122,687	(6,011)	28,398
Other	10,294	1,914	(5,016)
Net cash provided by operating activities	251,433	236,349	258,805
Cash flows from investing activities:
Purchase of property and equipment	(31,122)	(41,460)	(46,682)
Purchase of marketable securities	(103,499)	(83,563)	(9,476)
Proceeds from sales/maturities of marketable securities	69,683	47,936	13,781
Cash paid for acquisitions, net of cash acquired		(108,602)
Premium on company-owned life insurance policies	(15,353)	(15,699)	(34,862)
Proceeds from life insurance policies	18,707	2,280	7,632
Dividends received from unconsolidated subsidiaries	205	346	140
Net cash used in investing activities	(61,379)	(198,762)	(69,467)
Cash flows from financing activities:
Repurchases of common stock	(30,387)	(92,446)	(37,372)
Payments of tax withholdings on restricted stock	(4,989)	(8,993)	(20,698)
Proceeds from issuance of common stock upon exercise of employee stock options and in connection with an employee stock purchase plan	5,706	7,684	7,272
Borrowings under life insurance policies			31,870
Payments on life insurance policy loans	(12,279)	(943)	(5,316)
Principal payments on finance leases	(1,324)	(1,833)
Dividends paid to shareholders	(22,498)	(22,798)	(23,459)
Dividends paid to noncontrolling interest	(1,115)	(2,110)	(2,255)
Proceeds from long term debt		1,045,500	226,875
Principal payments on long term debt		(876,875)	(238,906)
Payment of debt issuance costs		(3,050)	(2,181)
Payment of contingent consideration from acquisitions		(455)	(455)
Net cash (used in) provided by financing activities	(66,886)	43,681	(64,625)
Effect of exchange rate changes on cash and cash equivalents	38,366	(18,384)	(19,201)
Net increase in cash and cash equivalents	161,534	62,884	105,512
Cash and cash equivalents at beginning of year	689,244	626,360	520,848
Cash and cash equivalents at end of the period	850,778	689,244	626,360
Supplemental cash flow information:
Cash used to pay interest	25,207	12,526	14,188
Cash used to pay income taxes, net of refunds	$ 55,317	$ 54,914	$ 58,408