Inventories (Narrative) (Details) pullet_and_breeder in Millions, layer in Millions	May 30, 2020 pullet_and_breeder layer
Inventory Disclosure [Abstract]
Pullets and breeders \| pullet_and_breeder	10.7
Layers \| layer	40.1

Agricultural Related Inventory, Pullets and Breeders

No definition available.

Name:	calm_AgriculturalRelatedInventoryPulletsandBreeders
Namespace Prefix:	calm_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant