Business Combinations (Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Thousands	Mar. 01, 2017	May 31, 2017	Nov. 30, 2016
Business Acquisition [Line Items]
Goodwill		$ 290,698	$ 278,067
DataRPM Corporation [Member]
Business Acquisition [Line Items]
Net working capital	$ (110)
Property, plant and equipment	68
Deferred taxes	(5,024)
Goodwill	12,601
Net assets acquired	28,335
Purchased technology [Member] | DataRPM Corporation [Member]
Business Acquisition [Line Items]
Finite-lived intangible assets	$ 19,900
Finite-lived intangible assets, useful life	5 years
Trade name [Member] | DataRPM Corporation [Member]
Business Acquisition [Line Items]
Finite-lived intangible assets	$ 800
Finite-lived intangible assets, useful life	5 years
Customer relationships [Member] | DataRPM Corporation [Member]
Business Acquisition [Line Items]
Finite-lived intangible assets	$ 100
Finite-lived intangible assets, useful life	5 years