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Goodwill and Intangible Assets - Schedule of Carrying Value of Goodwill (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 01, 2019 | Sep. 29, 2019 | Sep. 29, 2019 | Sep. 30, 2018 | Oct. 01, 2017
Goodwill [Roll Forward] |  |  |  |  |
Balance at beginning of the period |  |  | $ 798,820,000 | $ 740,886,000 |
Acquisitions |  |  | 146,699,000 | 85,879,000 |
Divestiture |  |  |  | (12,160,000) |
Impairment | $ 0 | $ (7,800,000) | (7,755,000) | 0 | $ 0
Translation and other |  |  | (12,944,000) | (15,785,000) |
Balance at end of the period |  | 924,820,000 | 924,820,000 | 798,820,000 | 740,886,000
GSG |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Balance at beginning of the period |  |  | 389,741,000 | 361,761,000 |
Acquisitions |  |  | 53,098,000 | 27,526,000 |
Divestiture |  |  |  | 0 |
Impairment |  |  | 0 |  |
Translation and other |  |  | (1,037,000) | 454,000 |
Balance at end of the period |  | 441,802,000 | 441,802,000 | 389,741,000 | 361,761,000
CIG |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Balance at beginning of the period |  |  | 409,079,000 | 379,125,000 |
Acquisitions |  |  | 93,601,000 | 58,353,000 |
Divestiture |  |  |  | (12,160,000) |
Impairment |  |  | (7,755,000) |  |
Translation and other |  |  | (11,907,000) | (16,239,000) |
Balance at end of the period |  | $ 483,018,000 | $ 483,018,000 | $ 409,079,000 | $ 379,125,000

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