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Summary of Significant Accounting Policies - Rollforward of Goodwill Activity by Reportable Segments (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Sep. 27, 2014
Goodwill [Roll Forward]  
Balance at September 28, 2013 $ 2,814.5
Disposition of a portion of a reporting unit (0.9)
Tax adjustments (0.7)
Foreign currency and other (2.1)
Balance at September 27, 2014 2,810.8
Diagnostics [Member]
  
Goodwill [Roll Forward]  
Balance at September 28, 2013 1,153.5
Disposition of a portion of a reporting unit (0.2)
Tax adjustments (0.7)
Foreign currency and other 1.5
Balance at September 27, 2014 1,154.1
Breast Health [Member]
  
Goodwill [Roll Forward]  
Balance at September 28, 2013 636.4
Disposition of a portion of a reporting unit (0.7)
Tax adjustments 0
Foreign currency and other (4.0)
Balance at September 27, 2014 631.7
GYN Surgical [Member]
  
Goodwill [Roll Forward]  
Balance at September 28, 2013 1,016.4
Disposition of a portion of a reporting unit 0
Tax adjustments 0
Foreign currency and other 0.4
Balance at September 27, 2014 1,016.8
Skeletal Health [Member]
  
Goodwill [Roll Forward]  
Balance at September 28, 2013 8.2
Disposition of a portion of a reporting unit 0
Tax adjustments 0
Foreign currency and other 0
Balance at September 27, 2014 $ 8.2