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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
	Sep. 30, 2019	Sep. 30, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	$ 339.9	$ 417.6
China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	176.8	227.8
Japan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	63.2	68.5
Taiwan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	65.2	76.4
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	16.5	15.4
South Korea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	16.4	20.1
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	$ 1.8	$ 9.4

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://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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X

- 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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