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Business Acquisitions - Summary of Changes to Goodwill Balance (Detail) - USD ($) $ in Millions	12 Months Ended	21 Months Ended
	Jun. 30, 2019	Jun. 30, 2020
Goodwill [Line Items]
Beginning balance	$ 318.6
Working capital adjustment	4.4
Ending balance	417.2	$ 327.6
Counsyl Inc [Member]
Goodwill [Line Items]
Beginning balance		94.9
Fair value adjustment to equipment	0.7	0.7
Intangible adjustment		2.9
Working capital adjustment		(1.1)
Change in deferred tax liability	$ 1.9	1.9
Ending balance		$ 99.3

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- Definition

Goodwill adjustment to deferred tax assets liabilities.

+ References

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- Definition

Goodwill, intangible adjustment.

+ References

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(1))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
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- Definition

Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e961-128460

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- Definition

Amount of transfers into (out of) an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (g)
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