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Restructuring Activities - Restructuring Liability Activities (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
November 2017 and April 2018 Restructuring Plan [Member] |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Additional accruals | $ 12.0 |  |
Cash payments | (9.0) |  |
Non-cash settlements | (0.7) |  |
Ending Balance | 2.3 |  |
November 2017 and April 2018 Restructuring Plan [Member] | Employee Severance and Benefits [Member] |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Additional accruals | 11.0 |  |
Cash payments | (8.8) |  |
Ending Balance | 2.2 |  |
November 2017 and April 2018 Restructuring Plan [Member] | Facility Consolidation and Related Charges [Member] |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Additional accruals | 1.0 |  |
Cash payments | (0.2) |  |
Non-cash settlements | (0.7) |  |
Ending Balance | 0.1 |  |
June 2016 Restructuring Plan [Member] |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Beginning Balance |  | $ 6.7 |
Additional accruals |  | 7.3 | $ 6.7
Adjustments | (0.2) |  |
Cash payments | (0.4) | (12.6) |
Non-cash settlements |  | (0.8) |
Ending Balance |  | 0.6 | 6.7
June 2016 Restructuring Plan [Member] | Employee Severance and Benefits [Member] |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Beginning Balance |  | 6.7 |
Additional accruals |  | 5.0 | 6.7
Cash payments |  | (11.7) |
Ending Balance |  |  | $ 6.7
June 2016 Restructuring Plan [Member] | Facility Consolidation and Related Charges [Member] |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Additional accruals |  | 2.3 |
Adjustments | (0.2) |  |
Cash payments | $ (0.4) | (0.9) |
Non-cash settlements |  | (0.8) |
Ending Balance |  | $ 0.6 |

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- Definition Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 17 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3367-108585 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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- Definition Amount of expense (reversal of expense) which increases (decreases) the restructuring reserve from an adjustment to a previously accrued restructuring liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)(2)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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