Net Income Per Share - Summary of Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Feb. 28, 2018	Feb. 28, 2017
Basic net income per share:
Net income attributable to Class A shareholders	$ 9,947	$ 861
Basic weighted-average shares	28,089	28,073
Basic net income per share	$ 0.35	$ 0.03
Diluted net income per share:
Net income attributable to Class A shareholders	$ 9,947	$ 861
Add: Additional net income attributable to Class A shares due to increased percentage ownership in OpCo, net of tax, from the conversion of Class B shares	5,191	514
Total	$ 15,138	$ 1,375
Basic weighted-average shares	28,089	28,073
Effect of dilutive securities:
Class B shares	15,500	15,500
Diluted weighted-average shares	43,589	43,573
Diluted net income per share	$ 0.35	$ 0.03