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Summary of Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  | 12 Months Ended |  |
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Jun. 30, 2014 item | Jun. 30, 2013 item | Jun. 30, 2012 item | Nov. 30, 2012 Sandvik Powdermet AB | Jun. 30, 2014 Computer software Minimum | Jun. 30, 2014 Computer software Maximum | Jun. 30, 2014 Intangible Assets Minimum | Jun. 30, 2014 Intangible Assets Maximum | Jun. 30, 2014 Carpenter Powder Products AB | Nov. 30, 2012 Carpenter Powder Products AB
Revenue Recognition |  |  |  |  |  |  |  |  |  |
Discounts, rebates, returns and allowances | $ 28.3 | $ 26.4 | $ 18.7 |  |  |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |  |  |  |  |  |
Ownership interest (as a percent) |  |  |  | 40.00% |  |  |  |  |  | 40.00%
Ownership interest of noncontrolling partner (as a percent) |  |  |  |  |  |  |  |  | 40.00% |
Research and development expenditures | 18.5 | 19.4 | 20.5 |  |  |  |  |  |  |
Inventory under FIFO method or average cost methods | 161.2 | 173.3 |  |  |  |  |  |  |  |
Estimated useful life |  |  |  |  | 3 years | 7 years | 2 years 6 months | 30 years |  |
Capitalized software amortization expense | $ 6.4 | $ 6.8 | $ 6.1 |  |  |  |  |  |  |
Number of former operating facility site that the liability for future costs is discounted to present value | 1 |  |  |  |  |  |  |  |  |
Liability for future costs discount amortization period | 20 years |  |  |  |  |  |  |  |  |
Number of share-based employee compensation plans | 2 |  |  |  |  |  |  |  |  |
Number of customers accounted for 10% or more of the sales | 0 | 0 | 0 |  |  |  |  |  |  |

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- Definition Aggregate of: (i) sales discounts given by the entity, including, but not limited to, early payments of accounts due, (ii) cash rebates offered on sales, (iii) the total deduction from sales during the period, and (iv) price reductions (allowance, price protection agreements) given by the entity. Discounts, rebates, returns and allowances are a deduction from gross revenue in arriving at net revenue. + References No definition available. + Details
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- Definition For each income statement presented, the amount charged to expense for amortization of capitalized computer software costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128487-111756 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + Details
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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 + Details
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