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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Thousands						12 Months Ended
	Jun. 25, 2020	Apr. 17, 2019	Jan. 16, 2019	Oct. 24, 2018	Jul. 18, 2018	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2018	May 30, 2019
Cash dividends [Abstract]
Total Dividend		$ 19,000	$ 19,000	$ 19,100	$ 19,200	$ 76,658	$ 75,752	$ 73,542
Class A Common Stock [Member]
Cash dividends [Abstract]
Common stock dividend (in dollars per share)						$ 1.36	$ 1.32	$ 1.28
Class B Common [Member]
Cash dividends [Abstract]
Common stock dividend (in dollars per share)						$ 1.36	$ 1.32	$ 1.28
Revolving Credit Facility [Member]
Amended and Restated Credit Agreement [Abstract]
Term of credit facility						5 years
Aggregate principal amount						$ 1,100,000			$ 1,250,000
Credit agreement issuance cost capitalized						$ 4,300
Term Loan A Facility [Member]
Amended and Restated Credit Agreement [Abstract]
Term of credit facility						5 years
Credit agreement face amount									$ 250,000
Credit agreement issuance cost capitalized						$ 900
Subsequent Event [Member] | Dividend Declared in Q1 2020 [Member]
Cash dividends [Abstract]
Total Dividend	$ 19,100
Subsequent Event [Member] | Class A Common Stock [Member] | Dividend Declared in Q1 2020 [Member]
Cash dividends [Abstract]
Date of Declaration by Board of Directors	Jun. 25, 2020
Common stock dividend (in dollars per share)	$ 0.3425
Dividend payable date	Jul. 22, 2020
Dividend record date	Jul. 07, 2020
Subsequent Event [Member] | Class B Common [Member] | Dividend Declared in Q1 2020 [Member]
Cash dividends [Abstract]
Date of Declaration by Board of Directors	Jun. 25, 2020
Common stock dividend (in dollars per share)	$ 0.3425
Dividend payable date	Jul. 22, 2020
Dividend record date	Jul. 07, 2020

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