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Business Segments and Geographic Information - Segment Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Mar. 29, 2014
Mar. 30, 2013
Mar. 29, 2014
Mar. 30, 2013
Sep. 28, 2013
Segment Reporting Information [Line Items]          
Total revenues $ 625,008 $ 612,663 $ 1,237,456 $ 1,244,025  
Operating income (loss) 50,250 5,542 111,535 68,771  
Depreciation and amortization 130,044 126,276 257,863 254,431  
Capital expenditures 21,356 24,396 37,741 46,843  
Identifiable assets 8,362,395   8,362,395   9,000,823
Diagnostics [Member]
         
Segment Reporting Information [Line Items]          
Total revenues 290,802 296,507 576,568 602,423  
Operating income (loss) 15,243 (46,978) 19,997 (32,683)  
Depreciation and amortization 94,612 89,402 186,798 180,944  
Capital expenditures 14,841 13,464 25,097 27,318  
Identifiable assets 4,528,340   4,528,340   4,667,942
Breast Health [Member]
         
Segment Reporting Information [Line Items]          
Total revenues 238,705 220,058 465,196 440,866  
Operating income (loss) 25,818 47,892 69,667 92,837  
Depreciation and amortization 9,163 10,124 18,524 20,054  
Capital expenditures 2,275 5,910 4,080 9,490  
Identifiable assets 877,923   877,923   932,206
GYN Surgical [Member]
         
Segment Reporting Information [Line Items]          
Total revenues 72,043 73,692 150,897 154,601  
Operating income (loss) 6,579 2,241 17,702 2,863  
Depreciation and amortization 26,042 26,524 52,088 53,003  
Capital expenditures 2,194 2,171 3,980 4,916  
Identifiable assets 1,802,207   1,802,207   1,849,518
Skeletal Health [Member]
         
Segment Reporting Information [Line Items]          
Total revenues 23,458 22,406 44,795 46,135  
Operating income (loss) 2,610 2,387 4,169 5,754  
Depreciation and amortization 227 226 453 430  
Capital expenditures 40 28 182 206  
Identifiable assets 33,369   33,369   33,508
Corporate [Member]
         
Segment Reporting Information [Line Items]          
Capital expenditures 2,006 2,823 4,402 4,913  
Identifiable assets $ 1,120,556   $ 1,120,556   $ 1,517,649