Earnings per Share (EPS) and Common Stock - Additional Information (Details) - USD ($)	3 Months Ended
	Dec. 31, 2020	Dec. 28, 2019	Sep. 30, 2020
Earnings Per Share And Common Stock [Abstract]
Stock option restricted shares and restricted stock units excluded from computation of EPS, shares	100,000	1,300,000
Common stock, shares authorized	500,000,000		500,000,000
Stock repurchase program, authorized amount	$ 1,000,000,000
Stock repurchased during period, value	$ 0	$ 0