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Quarterly Statement of Operations Information (Unaudited) - Summary of Quarterly Results of Operations (Detail) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Sep. 26, 2015
Jun. 27, 2015
Mar. 28, 2015
Dec. 27, 2014
Sep. 27, 2014
Jun. 28, 2014
Mar. 29, 2014
Dec. 28, 2013
Sep. 26, 2015
Sep. 27, 2014
Sep. 28, 2013
Quarterly Financial Information Disclosure [Abstract]                      
Total revenues $ 702.8 $ 693.9 $ 655.5 $ 652.8 $ 660.6 $ 632.6 $ 625.0 $ 612.4 $ 2,705.0 $ 2,530.7 $ 2,492.3
Gross profit 379.4 378.7 336.0 338.6 345.0 312.8 282.1 305.6 1,432.7 1,245.5 1,161.4
Net income (loss) $ 25.2 [1] $ 29.4 [1] $ 47.8 [1] $ 29.2 [1] $ 28.2 [2] $ 11.3 [2] $ (16.8) [2] $ (5.4) [2] $ 131.6 $ 17.3 $ (1,172.8)
Diluted net income (loss) per common share (in dollars per share) $ 0.09 $ 0.10 $ 0.17 $ 0.10 $ 0.10 $ 0.04 $ (0.06) $ (0.02) $ 0.45 $ 0.06 $ (4.36)
[1] Net loss in the first quarter of fiscal 2014 included restructuring charges of $18.4 million and a debt extinguishment loss of $2.9 million. Net loss in the second quarter of fiscal 2014 included an impairment charge related to the MRI breast coils product line of $28.6 million, restructuring charges of $11.6 million and a debt extinguishment loss of $4.4 million. Net income in the third quarter of fiscal 2014 included restructuring charges of $6.7 million. Net income in the fourth quarter of fiscal 2014 included restructuring and divestiture charges of $15.1 million and a $5.1 million IPR&D charge.
[2] Net income in the first quarter of fiscal 2015 included restructuring charges of $8.0 million and a debt extinguishment loss of $6.7 million. Net income in the third quarter of fiscal 2015 included restructuring and divestiture charges of $11.9 million and a debt extinguishment loss of $18.2 million. Net income in the fourth quarter of fiscal 2015 included restructuring charges of $6.5 million, a debt extinguishment loss of $37.8 million, and an other-than-temporary impairment charge of $7.8 million related to a marketable security.