Business Combinations (Schedule Of Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net ) (Details) - USD ($) $ in Millions			12 Months Ended
	Jul. 02, 2018	Feb. 02, 2018	Dec. 28, 2018	Dec. 29, 2017		Dec. 30, 2016
Business Combination, Separately Recognized Transactions [Line Items]
Total purchase consideration			$ 1,782.9	$ 331.2		$ 27.6
Goodwill			3,540.0	$ 2,287.1	[1]	$ 2,077.6
Waterfall Holdings [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Total purchase consideration	$ 1,211.3		1,211.3
Net tangible assets (liabilities) acquired	(0.9)
Intangible assets acquired	410.1
Research and Development in Process	12.9
Deferred tax liability	(61.2)
Less fair value of all assets/liabilities acquired	348.0
Goodwill	863.3
Net assets acquired, Cash and cash equivalents	9.1
Net assets acquired, Accounts receivable, net	25.1
Net assets acquired, Other receivables	1.3
Net assets acquired, Other current assets	4.3
Net assets acquired, Property and equipment, net	7.5
Net assets acquired, Other non-current assets	3.0
Net assets acquired, Accounts payable	(1.3)
Net assets acquired, Accrued compensation and benefits	(8.0)
Net assets acquired, Deferred revenue	(26.4)
Net assets acquired, Other current liabilities	(13.2)
Net assets acquired, Other non-current liabilities	(2.3)
eBuilder [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Total purchase consideration		$ 485.2	$ 485.2
Net tangible assets (liabilities) acquired		2.0
Intangible assets acquired		109.4
Deferred tax liability		(18.4)
Less fair value of all assets/liabilities acquired		93.0
Goodwill		392.2
Net assets acquired, Cash and cash equivalents		2.5
Net assets acquired, Accounts receivable, net		14.9
Net assets acquired, Other receivables		43.3
Net assets acquired, Other current assets		0.7
Net assets acquired, Other non-current assets		0.2
Net assets acquired, Accounts payable		(8.4)
Net assets acquired, Accrued compensation and benefits		0.0
Net assets acquired, Deferred revenue		(12.1)
Net assets acquired, Other current liabilities		(39.1)
Developed Product Technology
Business Combination, Separately Recognized Transactions [Line Items]
Estimated Useful Life			6 years
Developed Product Technology | Waterfall Holdings [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Intangible assets acquired	$ 225.4
Estimated Useful Life	6 years
Developed Product Technology | eBuilder [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Intangible assets acquired		$ 60.5
Estimated Useful Life		7 years
Order or Production Backlog [Member] | eBuilder [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Intangible assets acquired		$ 1.7
Estimated Useful Life		6 months
Customer Relationships [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Estimated Useful Life			8 years
Customer Relationships [Member] | Waterfall Holdings [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Intangible assets acquired	$ 158.6
Estimated Useful Life	10 years
Customer Relationships [Member] | eBuilder [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Intangible assets acquired		$ 42.4
Estimated Useful Life		10 years
Trade Names [Member] | Waterfall Holdings [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Intangible assets acquired	$ 8.9
Estimated Useful Life	5 years
Trade Names [Member] | eBuilder [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Intangible assets acquired		$ 4.8
Estimated Useful Life		7 years
Off-Market Favorable Lease [Member] | Waterfall Holdings [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Intangible assets acquired	$ 4.3
Minimum [Member] | Off-Market Favorable Lease [Member] | Waterfall Holdings [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Estimated Useful Life	4 years
Maximum [Member] | Off-Market Favorable Lease [Member] | Waterfall Holdings [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Estimated Useful Life	9 years

[1] See Note 2 for a summary of adjustments