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Segment Information, Geographic and Product Data (Details) | 12 Months Ended
--- | ---
Jun. 30, 2014 item | Jun. 30, 2013 item | Jun. 30, 2012 item
Major customer disclosure |  |  |
Number of reportable segments | 2 |  |
Number of customers accounted for 10% or more of the sales | 0 | 0 | 0

X
- Definition Represents the number of customers accounted for more than ten percent of the sales. + References No definition available. + Details
Name: | crs_EntityWideRevenueMajorCustomerNumber
Namespace Prefix: | crs_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_EntityWideRevenueMajorCustomerLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration