Leases - Narrative (Details) $ in Millions	Apr. 30, 2020 USD ($)
Leases [Abstract]
Expected sublease rental proceeds next five years	$ 27.2

Lessee, Operating Sublease, Rental Proceeds, Next Five Years

No definition available.

Name:	cldr_LesseeOperatingSubleaseRentalProceedsNextFiveYears
Namespace Prefix:	cldr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant