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Quarterly Financial Data (Unaudited) - Schedule Of Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions | 3 Months Ended | 12 Months Ended
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Sep. 29, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 30, 2017 | Sep. 30, 2017 | Jul. 01, 2017 | Apr. 01, 2017 | Dec. 31, 2016 | Sep. 29, 2018 | Sep. 30, 2017 | Oct. 01, 2016
Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 771,178 | $ 726,385 | $ 698,651 | $ 677,294 | $ 669,852 | $ 618,832 | $ 604,349 | $ 635,019 | $ 2,873,508 | $ 2,528,052 | $ 2,556,004
Gross profit (1) | (73,304) | (67,821) | (52,952) | (63,523) | (66,514) | (61,185) | (63,800) | (64,356) | (257,600) | (255,855) | (227,359)
Net income | 72,742 | $ 26,501 | 12,290 | (98,493) | $ 29,009 | $ 25,579 | $ 29,295 | $ 28,179 | 13,040 | 112,062 | $ 76,427
One-time Employee Bonus Impact on Effective Income Tax Rate |  |  | $ 13,500 |  |  |  |  |  |  |  |
Tax Reform Income Tax Expense (Benefit) | (38,600) |  |  | $ 124,500 |  |  |  |  | 85,900 |  |
Additions (reductions) to valuation allowance | 3,600 |  |  |  |  |  |  |  | (32,900) | $ 14,900 |
Other Tax Expense (Benefit) | $ 1,100 |  |  |  |  |  |  |  | $ (2,900) |  |
Tax Reform Income Tax Expense, Per Share | $ (1.24) |  |  | $ 3.59 |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Net Income, Per Share |  |  |  | $ 0.09 |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Diluted Earnings Per Share |  |  |  | 1.1 |  |  |  |  |  |  |
One-time Employee Bonus Impact of Effective Income Tax Rate, Per Share |  |  | $ 0.38 |  |  |  |  |  |  |  |
Earnings per share: |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | 2.27 | $ 0.81 | 0.37 | $ (2.93) | $ 0.86 | $ 0.76 | $ 0.87 | $ 0.84 | $ 0.40 | $ 3.33 | $ 2.29
Diluted (in dollars per share) | $ 2.20 | $ 0.79 | $ 0.36 | $ (2.93) | $ 0.84 | $ 0.74 | $ 0.84 | $ 0.82 | $ 0.38 | $ 3.24 | $ 2.24

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