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Inventories - Narrative (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Jun. 30, 2020
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Inventory, Net [Abstract] |  |
Inventory accounted for using a method other than LIFO | $ 114.3 | $ 136.3

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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