Retirement Plan (Details) - USD ($) $ in Millions	12 Months Ended
Nov. 30, 2017	Nov. 30, 2016	Nov. 30, 2015
Retirement Benefits [Abstract]
Company contributions to the plan	$ 2.1	$ 2.5	$ 2.4

Amount of discretionary contributions made by an employer to a defined contribution plan.

No definition available.

Name:	us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration