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Summary of Significant Accounting Policies - Goodwill (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2019
Goodwill and other Intangible Asset Impairment | $ 15,600 | $ 14,600 |  | $ 30,227 |
Goodwill, Gross |  |  | $ 1,088,487 | 1,081,452 | $ 1,084,064
Goodwill, Accumulated Impairment Loss |  |  | 810,872 | 810,872 | 784,053
Goodwill |  |  | 277,615 | 270,580 | 300,011
Goodwill, Period Increase (Decrease) |  |  | 7,035 | (2,612) |
Metal Cutting [Member] |  |  |  |  |
Goodwill, Gross |  |  | 455,276 | 448,241 | 450,853
Goodwill, Accumulated Impairment Loss |  |  | (177,661) | (177,661) | (150,842)
Goodwill |  |  | 277,615 | 270,580 | 300,011
Goodwill, Period Increase (Decrease) |  |  | 7,035 | (2,612) |
Infrastructure [Member] |  |  |  |  |
Goodwill, Gross |  |  | 633,211 | 633,211 | 633,211
Goodwill, Accumulated Impairment Loss |  |  | (633,211) | (633,211) | (633,211)
Goodwill |  |  | 0 | 0 | $ 0
Goodwill, Period Increase (Decrease) |  |  | $ 0 | $ 0 |

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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