Common Stock and Earnings (Loss) Per Share (Common and Preferred Stock) (Details)	Dec. 26, 2020 votes $ / shares shares	Dec. 28, 2019 $ / shares shares
Class of Stock [Line Items]
Common stock, shares authorized	80,000,000	80,000,000
Common stock, par value | $ / shares	$ 3.00	$ 3.00
Votes Per Share of Class B Common Stock | votes	20
Common stock, shares issued	14,557,435	15,025,087
Common Class A [Member]
Class of Stock [Line Items]
Common stock, shares authorized	80,000,000
Common stock, par value | $ / shares	$ 3
Common Class B [Member]
Class of Stock [Line Items]
Common stock, shares authorized	16,000,000
Common stock, par value | $ / shares	$ 3
Common Class C [Member]
Class of Stock [Line Items]
Common stock, shares authorized	200,000,000
Common stock, par value | $ / shares	$ 3
Common stock, shares issued	0
Preferred Stock [Member]
Class of Stock [Line Items]
Common stock, shares authorized	16,000,000
Common stock, shares issued	0