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DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Summary of Significant Accounting Policies (Details) $ in Millions | 12 Months Ended
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Jun. 30, 2020 USD ($) Installment | Jun. 30, 2019 USD ($) Installment | Jun. 30, 2018 USD ($) Installment
Summary of Significant Accounting Policies |  |  |
Number of customers with significant revenue | Installment | 2 | 1 | 1
Standard warranty coverage period | 12 months |  |
Non-qualified deferred compensation plan payout period | 15 years |  |
Minimum |  |  |
Summary of Significant Accounting Policies |  |  |
Standard warranty coverage period | 6 months |  |
Maximum |  |  |
Summary of Significant Accounting Policies |  |  |
Standard warranty coverage period | 12 months |  |
Selling, general and administrative |  |  |
Summary of Significant Accounting Policies |  |  |
Executive deferred compensation program, compensation expense (benefit) | $ | $ 13.3 | $ 13.6 | $ 19.9
Gain (loss), net on deferred compensation plan assets | $ | 13.9 | 14.7 | 19.5
Cash Long-Term Incentive Plan |  |  |
Summary of Significant Accounting Policies |  |  |
Executive deferred compensation program, compensation expense (benefit) | $ | $ 64.0 | $ 55.5 | $ 52.4
Cash Long-Term Incentive Plan | Minimum |  |  |
Summary of Significant Accounting Policies |  |  |
Cash long-term incentive plan, equal vesting installments | Installment | 3 |  |
Cash long-term incentive plan, percentage of equal vesting installments | 33.33% |  |
Cash long-term incentive plan, vesting period | 3 years |  |
Cash Long-Term Incentive Plan | Maximum |  |  |
Summary of Significant Accounting Policies |  |  |
Cash long-term incentive plan, equal vesting installments | Installment | 4 |  |
Cash long-term incentive plan, percentage of equal vesting installments | 25.00% |  |
Cash long-term incentive plan, vesting period | 4 years |  |

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