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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Detail Textual) - USD ($) $ in Millions | 12 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2018
Summary Of Significant Accounting Policies [Line Items] |  |  |
Amount of tax expense (benefit) for changes in the fair value of interest rate swap agreements | $ 8.7 | $ 6.4 | $ (4.2)
Accumulated other comprehensive loss related to foreign currency translation adjustments | (38.6) | (33.6) |
Accumulated other comprehensive loss related to fair value of interest rate swaps | (33.2) | (9.0) |
Accumulated other comprehensive loss related to unrecognized post-retirement medical plan costs | $ (0.5) | $ (0.6) |
Equipment and furniture |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful life | from three to eight years |  |
Leasehold improvements |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful life | over the remaining lease term or the useful life of the improvements, whichever is shorter |  |

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- Definition Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669646-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e681-108580 + Details
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