Business Combinations (Allocation of Assets and Liabilitiies) (Details) - USD ($) $ in Millions			9 Months Ended
	Jul. 02, 2018	Feb. 02, 2018	Sep. 28, 2018	Dec. 29, 2017	[1]
Business Acquisition [Line Items]
Goodwill			$ 3,548.6	$ 2,287.1
eBuilder [Member]
Business Acquisition [Line Items]
Purchase Consideration		$ 485.2	485.2
Intangible Assets Acquired		109.4
Deferred Tax Liability		(18.4)
Less fair value of all assets/liabilities acquired		92.3
Goodwill		392.9
Cash and cash equivalents		2.5
Accounts receivable, net		14.4
Other receivables		43.3
Other current assets		0.7
Other non-current assets		0.2
Accounts payable		(8.4)
Deferred revenue		(11.8)
Other current liabilities		(39.6)
Net tangible assets acquired		1.3
Waterfall Holdings [Member]
Business Acquisition [Line Items]
Purchase Consideration	$ 1,211.2		$ 1,211.2
Intangible Assets Acquired	406.6
Research and Development in Process	12.8
Deferred Tax Liability	(58.2)
Less fair value of all assets/liabilities acquired	351.9
Goodwill	859.3
Cash and cash equivalents	9.1
Accounts receivable, net	19.8
Other receivables	1.7
Other current assets	9.6
Property and equipment, net	7.6
Other non-current assets	3.2
Accounts payable	(1.3)
Accrued compensation and benefits	(8.7)
Deferred revenue	(23.9)
Other current liabilities	(11.4)
Other non-current liabilities	(2.2)
Net tangible assets acquired	3.5
Developed Product Technology [Member] | eBuilder [Member]
Business Acquisition [Line Items]
Intangible Assets Acquired		$ 60.5
Acquired Finite-lived Intangible Assets, Estimated Useful Life		7 years
Developed Product Technology [Member] | Waterfall Holdings [Member]
Business Acquisition [Line Items]
Intangible Assets Acquired	$ 222.0
Acquired Finite-lived Intangible Assets, Estimated Useful Life	6 years
Order or Production Backlog [Member] | eBuilder [Member]
Business Acquisition [Line Items]
Intangible Assets Acquired		$ 1.7
Acquired Finite-lived Intangible Assets, Estimated Useful Life		6 months
Customer Relationships [Member] | eBuilder [Member]
Business Acquisition [Line Items]
Intangible Assets Acquired		$ 42.4
Acquired Finite-lived Intangible Assets, Estimated Useful Life		10 years
Customer Relationships [Member] | Waterfall Holdings [Member]
Business Acquisition [Line Items]
Intangible Assets Acquired	$ 158.6
Acquired Finite-lived Intangible Assets, Estimated Useful Life	10 years
Trade Names [Member] | eBuilder [Member]
Business Acquisition [Line Items]
Intangible Assets Acquired		$ 4.8
Acquired Finite-lived Intangible Assets, Estimated Useful Life		7 years
Trade Names [Member] | Waterfall Holdings [Member]
Business Acquisition [Line Items]
Intangible Assets Acquired	$ 8.9
Acquired Finite-lived Intangible Assets, Estimated Useful Life	5 years
Off-Market Favorable Lease [Member] | Waterfall Holdings [Member]
Business Acquisition [Line Items]
Intangible Assets Acquired	$ 4.3
Minimum | Off-Market Favorable Lease [Member] | Waterfall Holdings [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Estimated Useful Life	4 years
Maximum | Off-Market Favorable Lease [Member] | Waterfall Holdings [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Estimated Useful Life	9 years

[1] See Note 2 for a summary of adjustments