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Acquisitions and Divestiture - Narrative (Details) $ in Millions |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 21, 2018 USD ($) | Jun. 29, 2017 USD ($) transaction | Feb. 28, 2017 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  |  |  | $ 268.7 | $ 263.4 | $ 244.8
Proceeds from sale of business |  |  |  | $ 0.0 | 12.0 | $ 0.0
Discontinued Operations, Disposed of by Sale | Specialty Steel Supply |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of separate transactions to complete the divestiture | transaction |  | 2 |  |  |  |
Proceeds from sale of business |  | $ 12.0 |  |  |  |
Pre tax loss from divestiture |  | $ 3.2 |  |  |  |
MB CalRAM LLC |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Asset purchase price | $ 13.3 |  |  |  |  |
Business combination, working capital | 0.2 |  |  |  |  |
Business combination, property, plant, and equipment | 2.6 |  |  |  |  |
Identifiable intangible assets | 5.2 |  |  |  |  |
Goodwill | $ 5.3 |  |  |  |  |
Puris LLC |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Asset purchase price |  |  | $ 35.3 |  |  |
Business combination, working capital |  |  |  |  | 1.7 |
Business combination, property, plant, and equipment |  |  |  |  | 6.5 |
Identifiable intangible assets |  |  |  |  | 8.5 |
Goodwill |  |  |  |  | $ 18.6 |

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