Income Taxes (Details) - USD ($)	3 Months Ended		6 Months Ended
	May 31, 2019	May 31, 2018	May 31, 2019	May 31, 2018	Nov. 30, 2018
Income Tax Expense (Benefit), Continuing Operations [Abstract]
Income tax expense	$ 9,300,000	$ 21,000,000	$ 13,800,000	$ 138,300,000
Effective tax rate	16.40%	26.80%	15.10%	111.20%
Net (increase) reduction in valuation allowance		$ 3,300,000	$ 3,300,000
Excess tax benefits related to stock-based compensation	$ (900,000)	(200,000)	(2,900,000)	$ (2,400,000)
Tax cuts and jobs act, non-cash charge				111,200,000
Tax cuts and jobs act, re-measurement of deferred tax assets				107,900,000
Tax credits	(4,300,000)	$ (200,000)	(4,300,000)	$ 4,200,000
Deferred tax assets	444,700,000		444,700,000		$ 465,400,000
Valuation allowance	20,300,000		20,300,000		23,600,000
Adjustments to deferred tax valuation allowance			0
Gross unrecognized tax benefits (including interest and penalties)	$ 0		$ 0		$ 0