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Goodwill and Other Intangible Assets - Carrying Amount of Goodwill Attributable to Each Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2016 | Mar. 31, 2016 | Mar. 31, 2017 | Jun. 30, 2016
Goodwill [Line Items] |  |  |  |
Goodwill, Foreign Currency Translation Gain (Loss) | $ (4,172) |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill |  |  | $ 1,078,368 | $ 1,082,540
Accumulated impairment losses |  |  | (784,053) | (784,053)
Goodwill, Beginning Balance | 298,487 |  |  |
Industrial [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, Foreign Currency Translation Gain (Loss) | (4,459) |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill |  |  | 404,246 | 408,705
Accumulated impairment losses |  |  | (137,204) | (137,204)
Goodwill, Beginning Balance | 271,501 |  |  |
Goodwill, Written off Related to Sale of Business Unit |  | $ (1,100) |  |
Infrastructure [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, Foreign Currency Translation Gain (Loss) | 0 |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill |  |  | 633,211 | 633,211
Accumulated impairment losses |  |  | (633,211) | (633,211)
Goodwill, Beginning Balance | 0 |  |  |
Goodwill, Written off Related to Sale of Business Unit |  | $ (6,500) |  |
WIDIA [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, Foreign Currency Translation Gain (Loss) | 287 |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill |  |  | 40,911 | 40,624
Accumulated impairment losses |  |  | $ (13,638) | $ (13,638)
Goodwill, Beginning Balance | $ 26,986 |  |  |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975 + Details
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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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