Consolidated Statement of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Oct. 02, 2016	Sep. 27, 2015	Sep. 28, 2014
Statement of Cash Flows [Abstract]
Gain (Loss) on Disposition of Business	$ (125.5)	$ 0.0	$ 0.0
Cash flows from operating activities:
Net income (loss)	(32.6)	84.6	23.1
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	46.1	36.2	32.9
Amortization of intangible assets	161.2	96.5	92.8
Provision for doubtful accounts	0.7	(0.2)	0.1
Amortization of deferred financing costs	33.1	1.6	1.3
Loss on disposition or impairment of assets	1.6	(1.1)	9.8
Deferred income taxes	(32.6)	(8.0)	(21.5)
Valuation allowance on deferred income taxes	35.3	13.3	17.6
Stock based compensation expense	101.1	49.8	43.9
Change in assets and liabilities (net of acquisitions):
Accounts receivable	(22.1)	13.8	5.2
Inventories	80.2	11.1	10.3
Other current assets	(20.3)	(2.5)	9.2
Other assets	2.2	(7.6)	(1.8)
Accounts payable	(35.8)	(2.9)	(5.5)
Accrued liabilities	(7.7)	(12.9)	(13.5)
Other long-term liabilities	89.7	(2.4)	2.8
Net cash provided by operating activities	274.6	269.3	206.7
Cash flows from investing activities:
Purchases of property and equipment	(48.8)	(44.1)	(39.4)
Proceeds from sale of short term investments	0.4	0.6	41.0
Proceeds from the divestiture or sale of assets	321.0	0.0	0.0
Proceeds from the sale of investment	0.0	4.2	0.0
Payments for acquisitions, net of cash acquired	(1,686.8)	(363.9)	(337.6)
Net cash used in investing activities	(1,414.2)	(403.2)	(336.0)
Cash flows from financing activities:
Repayments of credit facility	(1,132.4)	(142.7)	(178.0)
Credit facility issuance costs	(53.8)	(8.7)	(1.5)
Proceeds from credit facility	3,494.3	425.0	289.5
Extinguishment of debt	(1,198.1)	0.0	(89.5)
Payments for Repurchase of Common Stock	0.0	(75.0)	0.0
Settlement to terminate capital lease	0.0	0.0	(3.0)
Stock settled tax withholdings	42.4	18.1	1.5
Exercise proceeds from stock awards	5.1	47.6	19.1
Net cash (used in) provided by financing activities	1,072.7	228.1	35.1
Net increase (decrease) in cash and cash equivalents	(66.9)	94.2	(94.2)
Cash and cash equivalents at beginning of year	256.4	162.2	256.4
Cash and cash equivalents at end of year	189.5	256.4	162.2
Supplemental disclosure of cash flow information Cash paid during the year for:
Interest	89.1	27.4	29.2
Income taxes	$ 11.2	$ 3.3	$ 3.9