XML 50 R40.htm IDEA: XBRL DOCUMENT v3.8.0.1

Inventories - Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2018	Jun. 30, 2017
Inventory, Net [Abstract]
Other than LIFO inventory	$ 136.3	$ 107.3

X

- 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

X

- References

No definition available.

+ Details

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