Acquisitions - Component of Identifiable Intangible Assets (Details) - Crisp Media, Inc $ in Thousands	May 31, 2017 USD ($)
Acquired Finite Lived Intangible Assets [Line Items]
Identifiable intangible assets	$ 9,400
Developed Technologies
Acquired Finite Lived Intangible Assets [Line Items]
Identifiable intangible assets	$ 5,000
Estimated Useful Life (in Years)	4 years
Customer Relationships
Acquired Finite Lived Intangible Assets [Line Items]
Identifiable intangible assets	$ 2,800
Estimated Useful Life (in Years)	7 years
Trade Names
Acquired Finite Lived Intangible Assets [Line Items]
Identifiable intangible assets	$ 1,600
Estimated Useful Life (in Years)	4 years