CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2021
Cash flows from operating activities:
Net income	$ 213,054	$ 330,845	$ 115,562
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	68,335	63,521	61,845
Stock-based compensation expense	36,285	29,210	27,157
Impairment of right-of-use assets	5,471	7,392	0
Impairment of fixed assets	4,375	1,915	0
Provision for doubtful accounts	22,493	21,552	15,763
Gain on cash surrender value of life insurance policies	(10,576)	(5,819)	(13,017)
(Gain) loss on marketable securities	(2,874)	11,978	(38,529)
Deferred income taxes	(14,403)	(16,963)	(14,140)
Change in other assets and liabilities:
Deferred compensation	52,291	27,197	64,005
Receivables due from clients	33,483	(138,627)	(67,331)
Income taxes and other receivables	(25,615)	3,969	5,798
Prepaid expenses and other assets	(5,884)	(9,534)	(3,902)
Unearned compensation	11,904	(23,425)	(32,935)
Income taxes payable	(15,304)	12,751	(1,824)
Accounts payable and accrued liabilities	(27,821)	191,447	122,687
Other	(1,320)	(5,751)	10,294
Net cash provided by operating activities	343,894	501,658	251,433
Cash flows from investing activities:
Cash paid for acquisitions, net of cash acquired	(254,750)	(133,802)	0
Purchase of property and equipment	(70,382)	(49,406)	(31,122)
Purchase of marketable securities	(53,530)	(82,015)	(103,499)
Proceeds from sales/maturities of marketable securities	65,878	92,472	69,683
Premium on company-owned life insurance policies	(15,219)	(15,218)	(15,353)
Proceeds from life insurance policies	4,376	3,382	18,707
Dividends received from unconsolidated subsidiaries	150	255	205
Net cash used in investing activities	(323,477)	(184,332)	(61,379)
Cash flows from financing activities:
Repurchases of common stock	(95,463)	(96,258)	(30,387)
Payments of tax withholdings on restricted stock	(22,232)	(18,532)	(4,989)
Proceeds from issuance of common stock upon exercise of employee stock options and in connection with an employee stock purchase plan	7,606	6,919	5,706
Payments on life insurance policy loans	(2,760)	(178)	(12,279)
Principal payments on finance leases	(1,639)	(1,157)	(1,324)
Dividends paid to shareholders	(32,971)	(26,786)	(22,498)
Dividends paid to noncontrolling interest	(4,721)	(1,452)	(1,115)
Net cash used in financing activities	(152,180)	(137,444)	(66,886)
Effect of exchange rate changes on cash and cash equivalents	(2,283)	(52,590)	38,366
Net (decrease) increase in cash and cash equivalents	(134,046)	127,292	161,534
Cash and cash equivalents at beginning of year	978,070	850,778	689,244
Cash and cash equivalents at end of the year	844,024	978,070	850,778
Supplemental cash flow information:
Cash used to pay interest	25,409	24,607	25,207
Cash used to pay income taxes, net of refunds	$ 134,741	$ 107,602	$ 55,317