Acquisitions - Component of Identifiable Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 01, 2018	May 31, 2017
Ahalogy
Acquired Finite Lived Intangible Assets [Line Items]
Identifiable intangible assets	$ 11,580
Crisp Media, Inc
Acquired Finite Lived Intangible Assets [Line Items]
Identifiable intangible assets		$ 9,400
Developed Technologies | Ahalogy
Acquired Finite Lived Intangible Assets [Line Items]
Identifiable intangible assets	$ 3,100
Estimated Useful Life (in Years)	4 years
Developed Technologies | Crisp Media, Inc
Acquired Finite Lived Intangible Assets [Line Items]
Identifiable intangible assets		$ 5,000
Estimated Useful Life (in Years)		4 years
Customer Relationships | Ahalogy
Acquired Finite Lived Intangible Assets [Line Items]
Identifiable intangible assets	$ 6,210
Estimated Useful Life (in Years)	6 years
Customer Relationships | Crisp Media, Inc
Acquired Finite Lived Intangible Assets [Line Items]
Identifiable intangible assets		$ 2,800
Estimated Useful Life (in Years)		7 years
Trade Names | Ahalogy
Acquired Finite Lived Intangible Assets [Line Items]
Identifiable intangible assets	$ 650
Estimated Useful Life (in Years)	4 years
Trade Names | Crisp Media, Inc
Acquired Finite Lived Intangible Assets [Line Items]
Identifiable intangible assets		$ 1,600
Estimated Useful Life (in Years)		4 years
Vendor Relationships | Ahalogy
Acquired Finite Lived Intangible Assets [Line Items]
Identifiable intangible assets	$ 1,620
Estimated Useful Life (in Years)	2 years