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Goodwill and Intangibles Textuals (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($) | Sep. 30, 2016 USD ($)
Goodwill Textuals |  |  |  |
Amortization of intangibles | $ 24,371 | $ 25,580 | $ 25,797 |
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount | 20.00% |  |  |
Goodwill Impairment | $ 0 | 64,794 | 0 |
Goodwill | 206,135 | $ 202,700 | 254,406 |
Goodwill and Intangibles (Textuals) [Abstract] |  |  |  |
Amortization Expense for For 2018 | 22,500 |  |  |
Amortization Expense for For 2019 | 20,700 |  |  |
Amortization Expense for For 2020 | 18,900 |  |  |
Amortization Expense for For 2021 | 17,400 |  |  |
Amortization Expense for For 2022 | $ 15,100 |  |  |
Goodwill [Member] |  |  |  |
Goodwill Textuals |  |  |  |
Number of Reporting Units |  | 5 |  |
Goodwill [Member] |  |  |  |
Goodwill Textuals |  |  |  |
Number of Reporting Units |  | 2 |  |
Goodwill [Member] |  |  |  |
Goodwill Textuals |  |  |  |
Number of Reporting Units | 6 | 7 |  |
Canada Service Centers reporting unit [Member] |  |  |  |
Goodwill Textuals |  |  |  |
Reporting Unit, Amount of Fair Value in Excess of Carrying Amount |  |  |  | $ 8,000
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount |  |  |  | 5.00%
Goodwill, Fair Value Disclosure |  |  |  | $ 163,000
Goodwill Impairment |  | $ 56,022 |  |
Australia/New Zealand reporting unit [Member] |  |  |  |
Goodwill Textuals |  |  |  |
Goodwill Impairment |  | 8,772 |  |
U.S. Service Centers reporting unit [Member] |  |  |  |
Goodwill Textuals |  |  |  |
Goodwill, Transfers | $ 2,628 |  |  |
HUB acquisition measurement period adjustment impact [Member] |  |  |  |
Goodwill Textuals |  |  |  |
Amortization of intangibles | 156 |  |  |
Service Center Based Distribution Segment [Member] |  |  |  |
Goodwill Textuals |  |  |  |
Goodwill, Purchase Accounting Adjustments | 3,220 |  |  |
Amortization of intangibles | 18,669 | 19,595 | 19,561 |
Goodwill Impairment | 0 | 64,794 | 0 |
Goodwill | 201,740 | 198,486 | 253,477 |
Accumulated goodwill impairment losses | 64,794 |  |  |
Fluid Power Businesses Segment [Member] |  |  |  |
Goodwill Textuals |  |  |  |
Goodwill Impairment |  | 0 |  |
Goodwill | 4,395 | $ 4,214 | $ 929 |
Accumulated goodwill impairment losses | 36,605 |  |  |
Customer Relationships [Member] |  |  |  |
Goodwill Textuals |  |  |  |
Finite-Lived Intangible Assets, Purchase Accounting Adjustments | 2,636 |  |  |
Trade Names [Member] |  |  |  |
Goodwill Textuals |  |  |  |
Finite-Lived Intangible Assets, Purchase Accounting Adjustments | $ 584 |  |  |
Reliance U.S. businesses [Member] |  |  |  |
Goodwill Textuals |  |  |  |
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount | 149.00% |  |  |
Other Intangible Assets, Net | $ 15,657 |  |  |
Reliance Canada businesses [Member] |  |  |  |
Goodwill Textuals |  |  |  |
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount | 13.00% |  |  |
Other Intangible Assets, Net | $ 80,228 |  |  |

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