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Business Segments and Geographic Information - Segment Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 28, 2019 | Jun. 29, 2019 | Mar. 30, 2019 | Dec. 29, 2018 | Sep. 29, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 30, 2017 | Sep. 28, 2019 | Sep. 29, 2018 | Sep. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue | $ 865.8 | $ 852.4 | $ 818.4 | $ 830.7 | $ 813.5 | $ 824.0 | $ 789.3 | $ 791.1 | $ 3,367.3 | $ 3,217.9 | $ 3,058.8
Operating income |  |  |  |  |  |  |  |  | (123.8) | (237.9) | 1,370.2
Depreciation and amortization |  |  |  |  |  |  |  |  | 463.1 | 480.3 | 449.2
Capital expenditures |  |  |  |  |  |  |  |  | 109.1 | 105.6 | 107.6
Identifiable assets | 6,442.1 |  |  |  | 7,230.9 |  |  |  | 6,442.1 | 7,230.9 | 7,979.6
Corporate |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  | 7.7 | 7.3 | 21.0
Identifiable assets | 1,522.5 |  |  |  | 1,457.1 |  |  |  | 1,522.5 | 1,457.1 | 1,262.7
Diagnostics |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 1,205.5 | 1,147.4 | 1,197.1
Operating income |  |  |  |  |  |  |  |  | 163.1 | 145.5 | 1,054.2
Depreciation and amortization |  |  |  |  |  |  |  |  | 246.6 | 257.3 | 278.9
Capital expenditures |  |  |  |  |  |  |  |  | 59.2 | 57.7 | 50.9
Identifiable assets | 2,276.6 |  |  |  | 2,442.9 |  |  |  | 2,276.6 | 2,442.9 | 2,621.6
Breast Health |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 1,314.2 | 1,218.2 | 1,138.3
Operating income |  |  |  |  |  |  |  |  | 399.3 | 399.7 | 373.4
Depreciation and amortization |  |  |  |  |  |  |  |  | 36.8 | 22.7 | 19.7
Capital expenditures |  |  |  |  |  |  |  |  | 18.3 | 14.8 | 12.0
Identifiable assets | 1,127.8 |  |  |  | 972.4 |  |  |  | 1,127.8 | 972.4 | 824.0
Medical Aesthetics |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 315.6 | 339.1 | 207.5
Operating income |  |  |  |  |  |  |  |  | (781.2) | (844.7) | (115.9)
Depreciation and amortization |  |  |  |  |  |  |  |  | 91.4 | 108.1 | 54.2
Capital expenditures |  |  |  |  |  |  |  |  | 7.0 | 9.4 | 7.3
Identifiable assets | 159.3 |  |  |  | 913.3 |  |  |  | 159.3 | 913.3 | 1,751.2
GYN Surgical |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 437.2 | 422.0 | 427.1
Operating income |  |  |  |  |  |  |  |  | 99.2 | 58.3 | 65.0
Depreciation and amortization |  |  |  |  |  |  |  |  | 87.7 | 91.6 | 95.7
Capital expenditures |  |  |  |  |  |  |  |  | 15.7 | 13.1 | 15.2
Identifiable assets | 1,328.6 |  |  |  | 1,414.9 |  |  |  | 1,328.6 | 1,414.9 | 1,494.6
Skeletal Health |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 94.8 | 91.2 | 88.8
Operating income |  |  |  |  |  |  |  |  | (4.2) | 3.3 | (6.5)
Depreciation and amortization |  |  |  |  |  |  |  |  | 0.6 | 0.6 | 0.7
Capital expenditures |  |  |  |  |  |  |  |  | 1.2 | 3.3 | 1.2
Identifiable assets | $ 27.3 |  |  |  | $ 30.3 |  |  |  | $ 27.3 | $ 30.3 | $ 25.5

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