Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	3 Months Ended
Feb. 27, 2016	Feb. 28, 2015
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits at beginning of year	$ 3,859	$ 2,487
Additions for current period tax positions	144	175
Changes in interest and penalties	34	19
Unrecognized tax benefits at end of period	$ 4,037	$ 2,681

This element represents the total increase (decrease) in accruals as of the date of the statement of financial position for interest recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity and the amount of statutory penalties for a tax position claimed or expected to be claimed by the entity, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties. Unrecognized Tax Benefits, Period Increase (Decrease) Income Tax Penalties and Interest Accrued [Line Items]

No definition available.

Name:	clc_UnrecognizedTaxBenefitsPeriodIncreaseDecreaseIncomeTaxPenaltiesAndInterestAccrued
Namespace Prefix:	clc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration