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Inventories - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2017	Jun. 30, 2017
Inventory, Net [Abstract]
Other than LIFO inventory	$ 128.8	$ 107.3

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- Definition

Other than LIFO Inventory Amount

+ References

No definition available.

+ Details

Name:	crs_OtherthanLIFOInventoryAmount
Namespace Prefix:	crs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_InventoryNetAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration