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Restructurings- Additional Details (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 28, 2019 USD ($) facility employee | Sep. 27, 2019 USD ($) | Sep. 28, 2018 USD ($) | Sep. 29, 2017 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring cost |  | $ 19,543,000 | $ 6,265,000 | $ 2,744,000
Payments for restructuring |  | 17,105,000 | 6,803,000 |
Facility related expenses |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring cost |  | 11,459,000 | 3,476,000 | 0
Payments for restructuring |  | 10,481,000 | 3,476,000 |
Employee related costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring cost |  | 8,084,000 | 2,789,000 | $ 2,744,000
Payments for restructuring |  | 6,624,000 | 3,327,000 |
Long Beach, Belfast and Sydney Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring cost |  | 0 | 6,265,000 |
Payments for restructuring |  | 89,000 | 6,176,000 |
Expected remaining restructuring costs |  | 0 |  |
Long Beach, Belfast and Sydney Restructuring Plan | Facility related expenses |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring cost |  | 0 | 3,476,000 |
Payments for restructuring |  | 0 | 3,476,000 |
Long Beach, Belfast and Sydney Restructuring Plan | Employee related costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring cost |  | 0 | 2,789,000 |
Payments for restructuring |  | 89,000 | $ 2,700,000 |
Ithaca Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring cost |  | 5,450,000 |  |
Payments for restructuring |  | 5,367,000 |  |
Ithaca Restructuring Plan | Facility related expenses |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring cost |  | 3,969,000 |  |
Payments for restructuring |  | 3,899,000 |  |
Ithaca Restructuring Plan | Employee related costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring cost |  | 1,481,000 |  |
Payments for restructuring |  | 1,468,000 |  |
Design Facility Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring cost |  | 2,528,000 |  |
Payments for restructuring |  | 2,077,000 |  |
Design Facility Restructuring Plan | Facility related expenses |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring cost |  | 2,190,000 |  |
Payments for restructuring |  | 1,739,000 |  |
Design Facility Restructuring Plan | Employee related costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring cost |  | 338,000 |  |
Payments for restructuring |  | 338,000 |  |
2019 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring cost |  | 11,565,000 |  |
Payments for restructuring |  | 9,572,000 |  |
Number of positions eliminated | employee | 250 |  |  |
Number of facilities | facility | 7 |  |  |
2019 Restructuring Plan | Minimum |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Expected remaining restructuring costs |  | 2,500,000 |  |
Expected cost |  | 14,100,000 |  |
2019 Restructuring Plan | Maximum |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Expected remaining restructuring costs |  | 3,400,000 |  |
Expected cost |  | 15,000,000.0 |  |
2019 Restructuring Plan | Facility related expenses |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring cost |  | 5,300,000 |  |
Payments for restructuring |  | 4,843,000 |  |
2019 Restructuring Plan | Facility related expenses | Maximum |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Expected remaining restructuring costs | $ 800,000 |  |  |
2019 Restructuring Plan | Other Costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring cost |  | 1,300,000 |  |
2019 Restructuring Plan | Employee related costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring cost |  | 6,265,000 |  |
Payments for restructuring |  | 4,729,000 |  |
2019 Restructuring Plan | Employee related costs | Maximum |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Expected remaining restructuring costs |  | 2,600,000 |  |
2019 Restructuring Plan | Fixed Asset Impairment |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring cost |  | $ 4,000,000.0 |  |

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