Business Acquisition, Contingent Consideration, Guaranteed Amount

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- Definition

Number of shares of equity interests issued or issuable to acquire entity.

+ Details

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- Definition

Business Acquisition, Purchase Price Allocation Working Capital

+ Details

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- Definition

Business Acquisition, Revenue Reported By Entity for Current Annual Period

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

Escrow deposit, disbursement period description

+ Details

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- Definition

Merger agreement termination date

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- Definition

Merger agreement termination fee

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Ownership percentage of third party

+ Details

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- Definition

Pension Escrow Common Stock To Be Released Period In Years

+ Details

Name:	crs_PensionEscrowCommonStockToBeReleasedPeriodInYears
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Data Type:	xbrli:positiveIntegerItemType
Balance Type:	na
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- Definition

Stock issuance cost payable.

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- Definition

Amount of potential cash payments that could result from the contingent consideration arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 51
-Subparagraph f

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

Amount of cash paid to acquire the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 68
-Subparagraph f(1)

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 51
-Subparagraph d

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 51
-Subparagraph d

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

The amount of acquisition cost of a business combination allocated to an identifiable intangible asset that will be amortized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 52

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 51
-Subparagraph e

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 52
-Subparagraph c

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 53
-Subparagraph d

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 68
-Subparagraph k

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of acquisition cost of a business combination allocated to liabilities assumed.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 37
-Subparagraph g

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 98-1

+ Details

Name:	us-gaap_BusinessAcquisitionPurchasePriceAllocationLiabilitiesAssumed
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Data Type:	xbrli:monetaryItemType
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- Definition

The amount of acquisition cost of a business combination allocated to property, plant and equipment to be used in ongoing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 51
-Subparagraph e

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 37
-Subparagraph d

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

Total remaining unamortized or unaccreted amounts of premiums, discounts, and intangible assets, in years subsequent to the year of acquisition, when the total amounts of remaining discounts, premiums, and intangible assets exceed 30 percent of stockholders' equity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher OTS
-Name Federal Regulation (FR)
-Number Title 12
-Chapter V
-Section 563c.102
-Paragraph 24
-Subsection I

+ Details

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- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 59

+ Details

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- Definition

The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 15, 16, 17

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

Value of all classes of common stock held by shareholders, which is net of related treasury stock. May be all or a portion of the number of common shares authorized. These shares represent the ownership interest of the common shareholders.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 30
-Article 5

+ Details

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 159
-Paragraph 18
-Subparagraph f

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 18
-Paragraph 20
-Subparagraph a (1)

+ Details

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- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

+ Details

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Acquisition And Strategic Partnership (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended			0 Months Ended			12 Months Ended	0 Months Ended	6 Months Ended	12 Months Ended				1 Months Ended
	Jun. 30, 2011	Jun. 30, 2011 Indemnity Obligation [Member] Latrobe Specialty Metals, Inc.[Member]	Jun. 20, 2011 Indemnity Obligation [Member] Latrobe Specialty Metals, Inc.[Member]	Jun. 20, 2011 Pension Funding Obligation [Member] Latrobe Specialty Metals, Inc.[Member]	Jun. 30, 2011 Minimum [Member]	Jun. 30, 2011 Maximum [Member]	Jun. 30, 2011 Maximum [Member] Latrobe Specialty Metals, Inc.[Member]	Jun. 20, 2011 Latrobe Specialty Metals, Inc.[Member]	Jun. 20, 2011 Latrobe Specialty Metals, Inc.[Member]	Jun. 30, 2011 Latrobe Specialty Metals, Inc.[Member]	Jun. 30, 2011 Sandvik Powdermet AB [Member]	Jun. 30, 2011 Carpenter Powder Products AB [Member]	Jun. 30, 2011 Amega West Services, LLC [Member]	Jun. 27, 2011 Oifield Alloys [Member]
Business acquisition, shares issuable				300,000						8,100,000
Debt assumed in acquisition	$ 12.4						$ 160.0						$ 12.4
Stock issuance cost payable							4.0
Common stock value held as indemnity escrow			50
Escrow deposit, disbursement period description		Assuming no claims are asserted, half of the indemnity escrow will be released on the first anniversary of the closing and the remaining shares will be released after 24 months.
Period of common stock to be released from pension escrow, in years								5
Ownership percentage of third party									5.00%
Merger agreement termination date										September 30, 2011
Merger agreement termination fee										5
Acquisition related costs	3.1						10.0			2.4			0.7
Goodwill recorded related to the Amega West acquisition													8.3
Cash purchase price of acquired entity	41.6										6.2	9.1	41.6	4.8
Cash purchase price held back to pay earn-out participants													2.8
Earnout payments, guaranteed amount included in total purchase price													2.2
Ownership interest held by parent					20.00%	50.00%					40.00%
Ownership interest held by noncontrolling owners												40.00%
Current annual revenues reported by entity											20	20
Cash purchase price														4.1
Net cash acquired														0.3
Remaining purchase price														0.7
Purchase price allocation of working capital														1.2
Property, plant and equipment	25.9													1.7
Business acquisition, purchase price allocation, amortizable intangible assets														$ 1.9