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Goodwill and Other Intangible Assets Schedule of Goodwill (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2018
Goodwill [Line Items] |  |  |  |  |
Goodwill, Gross |  |  | $ 1,081,452 | $ 1,084,064 | $ 1,085,855
Goodwill, Accumulated Impairment Loss |  |  | (810,872) | (784,053) | (784,053)
Goodwill |  |  | 270,580 | 300,011 | 301,802
Goodwill, Period Increase (Decrease) |  |  | (2,612) | (1,791) |
Goodwill, Impairment Loss |  |  | (26,819) |  |
Industrial [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill, Gross |  |  | 407,784 | 409,912 | 411,458
Goodwill, Accumulated Impairment Loss |  |  | 137,204 | 137,204 | 137,204
Goodwill |  |  | 270,580 | 272,708 | 274,254
Goodwill, Period Increase (Decrease) |  |  | (2,128) | (1,546) |
Goodwill, Impairment Loss |  |  | 0 |  |
WIDIA [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill, Gross |  |  | 40,457 | 40,941 | 41,186
Goodwill, Accumulated Impairment Loss |  |  | 40,457 | 13,638 | 13,638
Goodwill |  |  | 0 | 27,303 | 27,548
Goodwill, Period Increase (Decrease) |  |  | (484) | (245) |
Goodwill, Impairment Loss | $ (13,700) | $ (13,100) | 26,819 |  |
Infrastructure [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
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 |
Goodwill, Impairment Loss |  |  | $ 0 |  |

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