Term Loan and Line of Credit (Narrative) (Details)	3 Months Ended
	Feb. 28, 2019 USD ($)
Credit Agreement
Line of Credit Facility [Line Items]
Principal repayments per eight payment schedules	$ 1,500,000
Principal repayments per four payment schedules, option one	2,300,000
Principal repayments per four payment schedules, option two	3,100,000
Principal repayments per three payment schedules	$ 3,900,000
Interest rate during period	4.00%
Debt issuance cost	$ 1,800,000
Amortization of debt issuance costs	100,000
Credit Agreement | Revolving line of credit
Line of Credit Facility [Line Items]
Term loan	123,750,000
Unsecured credit facility	150,000,000
Additional borrowing capacity available	125,000,000
Line of credit facility outstanding amount	0
Credit Agreement | Swing line loans
Line of Credit Facility [Line Items]
Term loan	25,000,000
Credit Agreement | Letter of credit
Line of Credit Facility [Line Items]
Term loan	25,000,000
Line of credit facility outstanding amount	1,300,000
Credit Agreement Maturing November 2022 | Revolving line of credit
Line of Credit Facility [Line Items]
Line of credit facility outstanding amount	116,000,000
Line of credit, current	$ 7,000,000