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Quarterly Financial Data - Schedule of Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 27, 2019 | Jun. 28, 2019 | Mar. 29, 2019 | Dec. 28, 2018 | Sep. 28, 2018 | Jun. 29, 2018 | Mar. 30, 2018 | Dec. 29, 2017 | Sep. 27, 2019 | Sep. 28, 2018 | Sep. 29, 2017
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 112,248 | $ 108,306 | $ 128,465 | $ 150,689 | $ 151,187 | $ 137,872 | $ 150,414 | $ 130,925 | $ 499,708 | $ 570,398 | $ 698,772
Gross profit | 52,925 | 33,828 | 57,330 | 76,625 | 70,982 | 48,169 | 65,601 | 60,954 | 220,708 | 245,706 | 326,884
Loss from continuing operations | $ 10,516 | $ (324,714) | $ (46,204) | $ (23,396) | (16,116) | (85,210) | (15,466) | (16,970) | (383,798) | (133,762) | (150,416)
Loss from discontinued operations |  |  |  |  | $ (378) | $ (220) | $ (18) | $ (5,599) | $ 0 | $ (6,215) | $ (19,077)
Per share data |  |  |  |  |  |  |  |  |  |  |
Loss from continuing operations (in USD per share) | $ 0.16 | $ (4.93) | $ (0.71) | $ (0.36) | $ (0.25) | $ (1.31) | $ (0.24) | $ (0.26) | $ (5.84) | $ (2.07) | $ (2.48)
Loss from discontinued operations (in USD per share) |  |  |  |  | (0.01) | 0.00 | 0.00 | (0.09) | 0 | (0.10) | (0.31)
Per share data |  |  |  |  |  |  |  |  |  |  |
Loss from continuing operations (in USD per share) | $ 0.16 | $ (4.95) | $ (0.71) | $ (0.44) | (0.29) | (1.31) | (0.50) | (0.49) | (5.84) | (2.47) | (2.48)
Loss from discontinued operations (in USD per share) |  |  |  |  | $ (0.01) | $ 0.00 | $ 0.00 | $ (0.09) | $ 0 | $ (0.10) | $ (0.31)
Warrant liability gain |  | $ 1,900 |  | $ 5,500 | $ 2,800 |  | $ 17,000 | $ 14,600 |  |  |

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