Discontinued Operations - Balance Sheet Disclosures (Details) - USD ($) $ in Millions	Sep. 29, 2017	Sep. 30, 2016	Oct. 02, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash		$ 32.1	$ 20.5
Current assets of discontinued operations	$ 11.1	355.6
Current liabilities of discontinued operations	2.5	83.0
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash	0.0	32.1
Accounts receivable, net	8.1	122.2
Inventories	2.9	197.3
Prepaid expenses and other current assets	0.1	4.0
Current assets of discontinued operations	11.1	355.6
Property, plant and equipment, net	0.0	120.6
Goodwill	0.0	74.7
Intangible assets	0.0	20.6
Deferred tax assets	0.0	2.1
Other assets	0.0	54.9
Total assets of discontinued operations	11.1	628.5
Accounts payable	2.0	41.9
Accrued liabilities	0.5	29.1
Deferred revenues	0.0	12.0
Current liabilities of discontinued operations	2.5	83.0
Other long-term liabilities	0.0	4.2
Total liabilities of discontinued operations	2.5	87.2
Redeemable noncontrolling interests of discontinued operations	$ 0.0	$ 10.3