Income Taxes (Details) - USD ($)	3 Months Ended		6 Months Ended
	May 31, 2020	May 31, 2019	May 31, 2020	May 31, 2019	Nov. 30, 2019
Income Tax Expense (Benefit), Continuing Operations [Abstract]
Income tax expense	$ 15,800,000	$ 9,300,000	$ 24,900,000	$ 13,800,000
Effective tax rate	23.30%	16.40%	18.20%	15.10%
Net (increase) reduction in valuation allowance				$ (3,300,000)
Excess tax benefits related to stock-based compensation		$ (900,000)	$ (5,600,000)	(2,900,000)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount	$ 1,000,000.0	800,000	2,000,000.0	1,200,000
Income Taxes Receivable, Alternative Minimum Tax, CARES Act	39,300,000
Tax credits	(3,000,000.0)	(4,300,000)	(7,000,000.0)	(4,300,000)
Deferred tax assets	276,800,000		276,800,000		$ 383,700,000
Valuation allowance	19,200,000		19,200,000		19,200,000
Deferred Tax Assets, Tax Credit Carryforwards	82,617,000	$ 0	82,617,000	$ 0
Adjustments to deferred tax valuation allowance			0
Gross unrecognized tax benefits (including interest and penalties)	0		0		$ 0
Income Taxes Receivable, Current	$ 43,300,000		$ 43,300,000