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Segment, Customers, and Geographic Information - Net Revenue within Geographic Areas Based on Customers' Locations (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	$ 334.0	$ 394.0	$ 1,177.1	$ 1,241.8
China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	190.0	204.9	669.5	624.6
Japan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	58.4	87.6	204.9	275.9
Taiwan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	47.6	53.2	185.0	156.5
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	19.6	18.7	48.9	56.5
South Korea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	13.8	15.5	45.6	49.2
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	$ 4.6	$ 14.1	$ 23.2	$ 79.1

X

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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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.

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