Debt - Credit Facility (Details) - USD ($)	3 Months Ended		9 Months Ended
	Aug. 31, 2021	Aug. 31, 2020	Aug. 31, 2021	Aug. 31, 2020	Apr. 30, 2019
Line of Credit Facility [Line Items]
Long-term debt, maturity, next 12 months	$ 26,338,000		$ 26,338,000
Amortization of debt issuance costs	392,000	$ 0	594,000	$ 0
Credit Agreement
Line of Credit Facility [Line Items]
Principal repayments, option one	1,900,000		1,900,000
Principal repayments, option two	3,800,000		3,800,000
Principal repayments, option three	5,600,000		5,600,000
Principal repayments, option four	7,500,000		7,500,000
Principal repayments, three payment schedules	$ 9,400,000		$ 9,400,000
Interest rate of credit facilities	2.13%		2.13%
Debt issuance cost	$ 2,900,000		$ 2,900,000
Amortization of debt issuance costs	100,000	$ 100,000	400,000	$ 400,000
Credit Agreement | Secured Revolving Credit Facility Maturing in 2024
Line of Credit Facility [Line Items]
Aggregate principal amount					$ 301,000,000
Unsecured credit facility					100,000,000
Additional borrowing capacity available					125,000,000
Fair value of term loan	272,800,000		272,800,000
Long-term debt, maturity, next 12 months	24,500,000		24,500,000
Credit Agreement | Swing Line Loans
Line of Credit Facility [Line Items]
Aggregate principal amount					25,000,000
Credit Agreement | Letter of Credit
Line of Credit Facility [Line Items]
Aggregate principal amount					$ 25,000,000
Letters of credit outstanding	$ 2,400,000		$ 2,400,000