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Description of Business and Summary of Significant Accounting Policies - Summary of Significant Accounting Policies (Details) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jul. 01, 2018 USD ($) | Jun. 30, 2019 USD ($) Installment customer | Jun. 30, 2018 USD ($) customer | Jun. 30, 2017 USD ($) customer
Summary of Significant Accounting Policies |  |  |  |
Number of customers with significant revenue | customer |  | 1 | 1 | 2
Number of customers with significant A/R | customer |  | 1 | 3 |
Standard warranty coverage period |  | 12 months |  |
Non-qualified deferred compensation plan payout period |  | 15 years |  |
Tax cuts and jobs act, reclassification from AOCI to Retained Earnings | $ 10.9 |  |  |
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) |  | $ 13.6 | $ 19.9 | $ 20.9
Gain (loss), net on deferred compensation plan assets |  | 14.7 | 19.5 | 20.8
Cash Long-Term Incentive Plan |  |  |  |
Summary of Significant Accounting Policies |  |  |  |
Executive deferred compensation program, compensation expense (benefit) |  | $ 55.5 | $ 52.4 | $ 48.8
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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