Inventories (Narrative) (Details) pullet_and_breeder in Millions, layer in Millions	Jun. 01, 2019 layer pullet_and_breeder
Inventory Disclosure [Abstract]
Pullets and breeders \| pullet_and_breeder	9.4
Layers \| layer	36.2

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