Leases - COVID-19 Update (Details) - USD ($) $ in Millions	3 Months Ended
Oct. 30, 2021	Oct. 31, 2020
Leases
Rent abatements due to the number of leases renegotiated in response to the negative financial impacts of COVID-19	$ 0.1	$ 0.8

Rent abatements due to the number of leases renegotiated in response to the negative financial impacts of COVID-19.

No definition available.

Name:	ctrn_RentAbatementsDueToNumberOfLeasesAgreementsRenegotiated
Namespace Prefix:	ctrn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration