Consolidated Statements Of Cash Flows - USD ($) $ in Millions		12 Months Ended
		Dec. 28, 2018		Dec. 29, 2017		Dec. 30, 2016
Cash flows from operating activities:
Net income	[1]	$ 283.3		$ 118.5		$ 132.2
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation expense		35.6		34.6	[1]	37.0	[1]
Amortization expense		179.6		148.8	[1]	150.8	[1]
Stock-based compensation		76.9		64.8	[1]	52.6	[1]
Income (loss) from equity method investments		1.9		(11.4)	[1]	0.0	[1]
Other non-cash items		14.7		(1.3)	[1]	18.4	[1]
Add decrease (increase) in assets:
Accounts receivable, net		(51.0)		(42.7)	[1]	3.8	[1]
Inventories		(45.0)		(37.3)	[1]	26.2	[1]
Other current and non-current assets		(22.6)		(10.0)	[1]	2.2	[1]
Add increase (decrease) in liabilities:
Accounts payable		(2.0)		25.7	[1]	10.8	[1]
Accrued compensation and benefits		18.6		34.0	[1]	0.3	[1]
Deferred revenue		76.3		19.3	[1]	19.5	[1]
Other liabilities		(79.6)		86.7	[1]	(22.7)	[1]
Net cash provided by operating activities		486.7		429.7	[1]	431.1	[1]
Cash flows from investing activities:
Acquisitions of businesses, net of cash acquired		(1,763.5)		(280.2)	[1]	(23.7)	[1]
Acquisitions of property and equipment		(67.6)		(43.7)	[1]	(26.0)	[1]
Purchases of short-term investments		(24.0)		(288.0)	[1]	(113.3)	[1]
Proceeds from maturities of short-term investments		6.2		122.1	[1]	2.4	[1]
Proceeds from sales of short-term investments		196.8		97.7	[1]	0.0	[1]
Other		2.5		20.9	[1]	13.7	[1]
Net cash used in investing activities		(1,649.6)		(371.2)	[1]	(146.9)	[1]
Cash flows from financing activities:
Issuance of common stock, net of tax withholdings		40.2		73.8	[1]	67.5	[1]
Repurchases of common stock		(93.0)		(285.3)	[1]	(119.5)	[1]
Proceeds from debt and revolving credit lines		2,976.4		786.0	[1]	355.0	[1]
Payments on debt and revolving credit lines		(1,925.1)		(495.4)	[1]	(465.3)	[1]
Other		(9.1)		(12.6)	[1]	(15.0)	[1]
Net cash provided by (used in) financing activities		989.4		66.5	[1]	(177.3)	[1]
Effect of exchange rate changes on cash and cash equivalents		(12.5)		17.4	[1]	(6.8)	[1]
Net increase (decrease) in cash and cash equivalents		(186.0)		142.4	[1]	100.1	[1]
Cash and cash equivalents, beginning of fiscal year	[1]	358.5	[2]	216.1		116.0
Cash and cash equivalents, end of fiscal year		$ 172.5		$ 358.5	[1],[2]	$ 216.1	[1]

[1] See Note 2 for a summary of adjustments

[2] See Note 2 for a summary of adjustments