Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Sep. 24, 2016	Sep. 26, 2015	Sep. 27, 2014
OPERATING ACTIVITIES
Net income	$ 330.8	$ 131.6	$ 17.3
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	82.3	81.5	94.7
Amortization	383.1	409.9	428.5
Non-cash interest expense	52.1	63.8	68.7
Stock-based compensation expense	65.4	59.3	50.0
Excess tax benefit related to equity awards	(11.0)	(10.7)	(5.7)
Deferred income taxes	(155.8)	(148.8)	(243.1)
Gain on sale of available-for-sale marketable security	(25.1)	0.0	0.0
Asset impairment charges	0.0	0.0	38.4
Debt extinguishment losses	(5.3)	(62.7)	(7.4)
Equity investment impairment charges	1.1	7.8	6.9
Loss on disposal of property and equipment	5.5	6.6	7.1
Loss on sale of businesses	0.0	9.6	5.5
Other adjustments and non-cash items	(2.9)	14.3	(11.8)
Changes in operating assets and liabilities:
Accounts receivable	(31.8)	(30.3)	7.9
Inventories	7.6	43.9	(44.7)
Prepaid income taxes	4.7	0.7	22.4
Prepaid expenses and other assets	(4.9)	5.7	17.3
Accounts payable	40.1	25.5	11.8
Accrued expenses and other liabilities	45.6	36.9	14.7
Deferred revenue	(4.9)	16.1	15.1
Net cash provided by operating activities	787.2	786.1	508.4
INVESTING ACTIVITIES
Net proceeds from sale of business	0.0	0.0	10.1
Purchase of property and equipment	(47.3)	(48.1)	(44.3)
Increase in equipment under customer usage agreements	47.2	41.3	(35.9)
Proceeds from sale of available-for-sale marketable security	31.1	0.0	0.0
Net (purchases) sales of insurance contracts	5.2	6.4	13.8
Purchases of mutual funds	0.0	0.0	(29.7)
Sales of mutual funds	5.2	10.0	22.4
Purchase of intellectual property	4.0	0.0	0.0
Increase in other assets	1.0	0.3	(3.4)
Net cash used in investing activities	(68.4)	(86.1)	(67.0)
FINANCING ACTIVITIES
Proceeds from long-term debt	0.0	2,495.1	0.0
Repayment of long-term debt	(75.0)	(3,095.0)	(595.0)
Payments to extinguish convertible notes	(392.8)	(543.7)	0.0
Proceeds from Lines of Credit	50.0	358.0	0.0
Repayments of Lines of Credit	(225.0)	(183.0)	0.0
Proceeds from accounts receivable securitization agreement	200.0	0.0	0.0
Repurchase of common stock	250.0	0.0	0.0
Payment of debt issuance costs	0.0	(22.7)	(2.4)
Interest Rate Cap Agreements Aggregate Premium Payable	0.0	(13.2)	0.0
Payment of deferred acquisition consideration	0.0	0.0	(5.0)
Net proceeds from issuance of common stock pursuant to employee stock plans	38.5	70.0	81.4
Excess tax benefit related to equity awards	11.0	10.7	5.7
Payment of minimum tax withholdings on net share settlements of equity awards	16.4	12.9	(9.8)
Net cash used in financing activities	(659.7)	(936.7)	(525.1)
Effect of exchange rate changes on cash and cash equivalents	(2.0)	(8.1)	(2.7)
Net increase (decrease) in cash and cash equivalents	57.1	(244.8)	(86.4)
Cash and cash equivalents, beginning of period	491.3	736.1	822.5
Cash and cash equivalents, end of period	$ 548.4	$ 491.3	$ 736.1