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Summary of Significant Accounting Policies - Rollforward of Goodwill Activity by Reportable Segments (Detail)
$ in Millions
 12 Months Ended
Sep. 24, 2016
USD ($)
Goodwill [Line Items]  
Goodwill Tax Adjustments $ 1.3
Goodwill [Roll Forward]  
Balance at September 26, 2015 2,808.2
Foreign currency and other (3.8)
Balance at September 24, 2016 2,803.1
Diagnostics [Member]  
Goodwill [Line Items]  
Goodwill Tax Adjustments 1.3
Goodwill [Roll Forward]  
Balance at September 26, 2015 1,152.3
Foreign currency and other (2.8)
Balance at September 24, 2016 1,148.2
Breast Health [Member]  
Goodwill [Line Items]  
Goodwill Tax Adjustments 0.0
Goodwill [Roll Forward]  
Balance at September 26, 2015 631.8
Foreign currency and other 0.0
Balance at September 24, 2016 631.8
GYN Surgical [Member]  
Goodwill [Line Items]  
Goodwill Tax Adjustments 0.0
Goodwill [Roll Forward]  
Balance at September 26, 2015 1,016.0
Foreign currency and other (1.0)
Balance at September 24, 2016 1,015.0
Skeletal Health [Member]  
Goodwill [Line Items]  
Goodwill Tax Adjustments 0.0
Goodwill [Roll Forward]  
Balance at September 26, 2015 8.1
Foreign currency and other 0.0
Balance at September 24, 2016 $ 8.1