DISCONTINUED OPERATIONS - Cash Flow Disclosures (Details) - USD ($) $ in Millions	9 Months Ended
	Jun. 30, 2017	Jul. 01, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Share-based compensation expense	$ 32.7	$ 36.0
Depreciation expense	45.2	46.7
Amortization expense	13.3	9.7
Purchases of property, plant and equipment	(40.4)	(61.0)
Sale of available-for-sale securities	0.0	8.6
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]
Share-based compensation expense	2.0	4.4
Depreciation expense	4.8	7.6
Amortization expense	1.8	4.2
Purchases of property, plant and equipment	(6.4)	(24.2)
Sale of available-for-sale securities	0.0	8.6
Acquisition of business, net of cash acquired	$ 0.0	$ 1.2