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Business Segments and Geographic Information - Segment Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 26, 2016 | Mar. 28, 2015 | Mar. 26, 2016 | Mar. 28, 2015 | Sep. 26, 2015
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | $ 693.3 | $ 655.5 | $ 1,388.4 | $ 1,308.3 |
Operating income (loss) | 136.1 | 109.8 | 262.1 | 213.3 |
Depreciation and amortization | 114.0 | 126.6 | 229.9 | 248.6 |
Capital expenditures | 22.0 | 18.7 | 41.7 | 39.7 |
Identifiable assets | 7,286.3 |  | 7,286.3 |  | $ 7,670.1
Diagnostics |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 304.4 | 296.7 | 615.1 | 600.8 |
Operating income (loss) | 34.3 | 27.1 | 65.8 | 55.3 |
Depreciation and amortization | 83.8 | 91.9 | 167.4 | 180.5 |
Capital expenditures | 13.0 | 11.4 | 24.9 | 26.2 |
Identifiable assets | 3,912.0 |  | 3,912.0 |  | 4,055.8
Breast Health |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 275.8 | 255.5 | 537.9 | 497.5 |
Operating income (loss) | 88.4 | 75.4 | 160.0 | 135.9 |
Depreciation and amortization | 5.1 | 8.3 | 12.4 | 15.9 |
Capital expenditures | 3.4 | 3.0 | 5.4 | 5.5 |
Identifiable assets | 811.8 |  | 811.8 |  | 815.4
GYN Surgical |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 90.9 | 79.1 | 189.7 | 163.5 |
Operating income (loss) | 11.5 | 4.5 | 32.3 | 17.7 |
Depreciation and amortization | 24.8 | 26.0 | 49.5 | 51.5 |
Capital expenditures | 3.4 | 2.4 | 6.8 | 4.4 |
Identifiable assets | 1,612.2 |  | 1,612.2 |  | 1,658.1
Skeletal Health |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 22.2 | 24.2 | 45.7 | 46.5 |
Operating income (loss) | 1.9 | 2.8 | 4.0 | 4.4 |
Depreciation and amortization | 0.3 | 0.4 | 0.6 | 0.7 |
Capital expenditures | 0.1 | 0.1 | 0.2 | 0.2 |
Identifiable assets | 29.9 |  | 29.9 |  | 25.3
Corporate |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Capital expenditures | 2.1 | $ 1.8 | 4.4 | $ 3.4 |
Identifiable assets | $ 920.4 |  | $ 920.4 |  | $ 1,115.5

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