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Employee Benefit Plans - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2019
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax | $ 2.2 | $ 2.8 | $ 3.0
Defined Benefit Plan, Expected Future Benefit Payment, after Year Five for Next Five Years | 5.7 |  |
Defined Contribution Plan, Cost | 3.7 | 3.1 | 1.7
Pension Plan [Member] |  |  |
Defined Benefit Plan, Service Cost | 1.2 | 1.2 | $ 1.1
Pension Plan [Member] | Defined Benefit Plan, Unfunded Plan [Member] |  |  |
Defined Benefit Plan, Benefit Obligation | 12.3 | 11.9 |
Other Postretirement Benefits Plan [Member] | Defined Benefit Plan, Unfunded Plan [Member] |  |  |
Defined Benefit Plan, Benefit Obligation | $ 0.7 | $ 0.7 |

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- Definition Amount, after tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669686-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669646-108580 + Details
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- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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