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Capital Stock and Changes in Capital Accounts (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
	Jul. 24, 2019	Jul. 31, 2019	Jul. 31, 2018
Cash dividend [Abstract]
Cash dividends		$ 19,252	$ 19,043
Dividend Declared in Q1 2020 [Member]
Cash dividend [Abstract]
Cash dividends	$ 19,200
Class A [Member]
Share repurchases [Abstract]
Shares repurchased (in shares)		217,511	125,932
Average purchase price (in dollars per share)		$ 45.97	$ 63.48
Cash dividend [Abstract]
Common stock (in dollars per share)		$ 0.34	$ 0.33
Changes in Common Stock [Abstract]
Number of shares, beginning of year (in shares)		70,126,963	70,111,000
Common stock class conversions and other		12,000	4,000
Number of shares issued, end of period (in shares)		70,138,555	70,115,000
Changes in Common Stock in Treasury [Abstract]
Number of shares held, beginning of year (in shares)		22,633,869	21,853,000
Purchase of treasury shares (in shares)		218,000	126,000
Restricted shares, forfeited (in shares)		1,000	0
Restricted shares issued from exercise of stock options (in shares)		(12,000)	(221,000)
Shares withheld for taxes (in shares)		33,000	41,000
Other (in shares)		0	4,000
Number of shares held, end of period (in shares)		22,795,256	21,722,000
Number of Common Stock outstanding, end of period (in shares)		47,344,000	48,393,000
Class A [Member] | Non-Performance Shares [Member]
Changes in Common Stock in Treasury [Abstract]
Restricted shares issued under stock-based compensation plans (in shares)		(36,000)	(22,000)
Class A [Member] | Performance Share Units [Member]
Changes in Common Stock in Treasury [Abstract]
Restricted shares issued under stock-based compensation plans (in shares)		(43,000)	(59,000)
Class A [Member] | Dividend Declared in Q1 2020 [Member]
Cash dividend [Abstract]
Dividend declared date		Jun. 27, 2019
Common stock (in dollars per share)		$ 0.34
Dividend paid date		Jul. 24, 2019
Dividend record date		Jul. 10, 2019
Class B [Member]
Cash dividend [Abstract]
Common stock (in dollars per share)		$ 0.34	$ 0.33
Changes in Common Stock [Abstract]
Number of shares, beginning of year (in shares)		13,054,707	13,071,000
Common stock class conversions and other		(12,000)	(4,000)
Number of shares issued, end of period (in shares)		13,043,115	13,067,000
Changes in Common Stock in Treasury [Abstract]
Number of shares held, beginning of year (in shares)		3,917,574	3,918,000
Number of shares held, end of period (in shares)		3,917,574	3,918,000
Number of Common Stock outstanding, end of period (in shares)		9,125,000	9,149,000
Class B [Member] | Dividend Declared in Q1 2020 [Member]
Cash dividend [Abstract]
Dividend declared date		Jun. 27, 2019
Common stock (in dollars per share)		$ 0.34
Dividend paid date		Jul. 24, 2019
Dividend record date		Jul. 10, 2019

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