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Acquisitions and Investments - Narrative (Details)
$ in Millions
3 Months Ended 12 Months Ended
Nov. 30, 2018
acquisition
Aug. 31, 2018
USD ($)
Business Combinations [Abstract]    
Number of acquisitions completed | acquisition 0  
Goodwill   $ 77.0
Identified intangible assets   $ 81.8
Weighted average useful life of acquired intangible assets   14 years