Condensed Consolidated Statement of Comprehensive Income - USD ($) $ in Thousands	4 Months Ended
	Jan. 19, 2020	Jan. 20, 2019
Statement of Comprehensive Income [Abstract]
Net earnings	$ 7,897	$ 34,098
Net change in fair value of derivatives	0	(7,167)
Net loss reclassified to earnings	0	479
Cash flow hedges, before tax	0	(6,688)
Tax effect	0	1,723
Cash flow hedges, net	0	(4,965)
Actuarial gains arising during the period	28,583	0
Actuarial losses and prior service costs reclassified to earnings	40,310	1,205
Unrecognized periodic benefit costs	68,893	1,205
Tax effect	(17,882)	(311)
Unrecognized periodic benefit costs	51,011	894
Other comprehensive income (loss), net of taxes	51,011	(4,071)
Comprehensive income	$ 58,908	$ 30,027