Acquisitions (Details Numeric) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
		Mar. 01, 2019	Nov. 30, 2018	Jan. 23, 2019	Oct. 31, 2018	Oct. 17, 2018	Jun. 18, 2018
Allegorithmic
Business Acquisition
Business Combination, Purchase Price for Remaining Interest				$ 105,300
Total estimated purchase price				159,700
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain (Loss), Net		$ 41,500
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value		54,400
Goodwill, Acquired during period		124,500
Total identifiable intangible assets acquired				$ 45,000
Marketo
Business Acquisition
Total estimated purchase price					$ 4,732,768
Goodwill, Acquired during period	[1]		$ 3,458,556
Cash and cash equivalents assumed					54,900
Trade receivables acquired					71,600
Accrued expenses assumed					102,600
Deferred Revenue Assumed					74,800
Deferred Tax Liabilities assumed, net					182,600
Deferred Tax Liabilities Assumed for Future Amortization of Intangible Assets					348,800
Deferred Tax Assets Acquired					166,200
Total identifiable intangible assets acquired					1,468,800
Net assets acquired or liabilities assumed					$ (194,588)
Magento
Business Acquisition
Total estimated purchase price							$ 1,644,601
Goodwill, Acquired during period	[2]		$ 1,316,983
Total identifiable intangible assets acquired							395,800
Net assets acquired or liabilities assumed							$ (68,182)
Term Loan | Marketo
Business Acquisition
Term Loan, Amount Outstanding		$ 2,250,000				$ 2,250,000

[1] Non-deductible for tax-purposes.

[2] Non-deductible for tax-purposes