Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	May 31, 2018	May 31, 2017	May 31, 2018	May 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 16,670	$ 13,227	$ 186,016	$ 34,500
Other comprehensive income:
Amortization of terminated interest rate swap, net of tax benefit	200	167	389	334
Comprehensive income	$ 16,870	$ 13,394	$ 186,405	$ 34,834