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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		6 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	$ 430.4	$ 461.3	$ 847.8	$ 847.5
China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	209.9	229.0	419.7	407.2
Japan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	97.3	123.7	188.3	197.7
Taiwan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	60.2	18.6	103.3	33.4
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	28.8	57.0	65.0	121.3
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	21.7	4.8	37.8	8.6
South Korea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	$ 12.5	$ 28.2	$ 33.7	$ 79.3

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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.

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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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