Inventories (Narrative) (Details) pullet_and_breeder in Millions, Layers in Millions	Nov. 29, 2025 Layers pullet_and_breeder	May 31, 2025 Layers pullet_and_breeder
Inventories [Abstract]
Pullets and breeders \| pullet_and_breeder	11.4	11.5
Layers \| Layers	49.3	48.3

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