Consolidated and Combined Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 30, 2016	Dec. 29, 2017	Sep. 30, 2016	Sep. 25, 2015
Restricted Cash and Investments, Current	$ 0.1	$ 0.0	$ 0.1	$ 47.7
Restricted Cash and Investments, Noncurrent	19.0	18.2	19.0	19.0
Cash and Cash Equivalents, Including Restricted Cash	361.1	1,279.1	299.6	432.6
Cash and cash equivalents	342.0	1,260.9	280.5	365.9
Cash Flows from Operating Activities:
Net income (loss)	(153.2)	2,134.4	643.7	324.7
Adjustments to reconcile net cash provided by operating activities:
Depreciation and amortization	203.2	808.3	834.5	672.5
Share-based compensation	11.0	59.2	42.9	117.0
Deferred income taxes	(204.3)	(1,744.1)	(432.9)	(191.6)
Non-cash impairment charges	214.3	63.7	16.9	0.0
Inventory provisions	8.5	34.1	29.2	0.0
Gain (Loss) on Disposition of Business	0.0	(418.1)	(95.3)	0.0
Other non-cash items	(9.2)	(21.4)	29.6	(25.5)
Changes in assets and liabilities, net of the effects of acquisitions:
Accounts receivable, net	36.5	(16.2)	31.2	0.7
Inventories	(26.3)	(23.6)	(17.3)	61.3
Accounts payable	5.4	(25.8)	(9.7)	20.4
Income taxes	0.6	(34.2)	93.9	30.2
Other	109.1	(89.0)	17.9	(79.2)
Net cash from operating activities	195.6	727.3	1,184.6	930.5
Cash Flows from Investing Activities:
Capital expenditures	(65.2)	(186.1)	(182.9)	(148.0)
Acquisitions and intangibles, net of cash acquired	(1.8)	(76.3)	(245.4)	(2,154.7)
Proceeds from Divestiture of Businesses, Net of Cash Divested	0.0	576.9	266.7	0.0
Other	(10.2)	3.9	6.0	3.0
Net cash from investing activities	(77.2)	318.4	(155.6)	(2,299.7)
Cash Flows from Financing Activities:
Issuance of external debt	190.0	1,465.0	98.3	3,010.0
Repayment of external debt and capital leases	(86.7)	(917.2)	(568.6)	(1,848.4)
Debt financing costs	0.0	(12.7)	(0.1)	(39.9)
Proceeds from exercise of share options	0.4	4.1	14.0	34.4
Repurchase of shares	(158.8)	(651.7)	(652.9)	(92.2)
Other	1.2	(17.7)	(53.0)	(28.1)
Net cash from financing activities	(53.9)	(130.2)	(1,162.3)	1,035.8
Effect of currency rate changes on cash	(3.0)	2.5	0.3	(11.6)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	61.5	918.0	(133.0)	(345.0)
Supplemental Disclosures of Cash Flow Information:
Cash paid for interest	95.4	339.1	332.4	200.5
Cash paid for income taxes, net	$ 95.6	$ 73.4	$ 165.4	$ 123.8