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Stock-Based Compensation - Summary of Grants of Common Stock to Outside Directors (Detail) - Common Stock Awards [Member] - Outside Directors [Member] - Immediate Vesting [Member] - $ / shares
6 Months Ended 12 Months Ended
Apr. 01, 2019
Oct. 01, 2018
Oct. 02, 2017
Oct. 03, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common Stock Awarded 2,948 3,600 4,800 4,800
Price Per Share [1] $ 19.18 $ 23.45 $ 33.20 $ 29.80
[1] Price per share represents closing price of our common stock on the date of grant.