Condensed Consolidated Statement of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 11, 2021	Apr. 12, 2020	Apr. 11, 2021	Apr. 12, 2020
Statement of Comprehensive Income [Abstract]
Net earnings	$ 35,934	$ 11,463	$ 86,793	$ 19,360
Actuarial losses arising during the period	0	(61,090)	0	(32,507)
Actuarial losses and prior service costs reclassified to earnings	1,138	1,362	2,655	41,672
Unrecognized periodic benefit costs	1,138	(59,728)	2,655	9,165
Tax effect	(296)	15,503	(690)	(2,379)
Other comprehensive income (loss), net of taxes	842	(44,225)	1,965	6,786
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Total	842	(44,225)	1,965	6,786
Comprehensive income (loss)	$ 36,776	$ (32,762)	$ 88,758	$ 26,146