Stockholders' Equity and Noncontrolling Interests - Rollforward (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2016	Oct. 02, 2015	Sep. 26, 2014
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Balance at beginning of period	$ 14.7
Net earnings (loss) attributable to noncontrolling interests	0.4	$ 0.5	$ 0.0
Acquisition of Mevis		10.2
Balance at end of period	3.7	14.7
Stockholders' Equity Attributable to Redeemable Noncontrolling Interest
Balance at beginning of period	0.0	0.0
Net earnings (loss) attributable to noncontrolling interests	0.5	0.0
Acquisition of Mevis	0.0	0.0
Capital contribution from noncontrolling interest holders	0.0	0.0
Reclassification of noncontrolling interests in MeVis to redeemable noncontrolling interests	10.4	0.0
Other	(0.6)	0.0
Balance at end of period	10.3	0.0	0.0
Noncontrolling Interests
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Balance at beginning of period	14.7	0.0
Net earnings (loss) attributable to noncontrolling interests	(0.1)	0.5
Acquisition of Mevis	0.0	10.2
Capital contribution from noncontrolling interest holders	0.0	4.0
Reclassification of noncontrolling interests in MeVis to redeemable noncontrolling interests	(10.4)	0.0
Other	(0.5)	0.0
Balance at end of period	$ 3.7	$ 14.7	$ 0.0