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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, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	$ 394.0	$ 444.2	$ 1,241.8	$ 1,291.7
China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	204.9	227.5	624.6	634.7
Japan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	87.6	118.9	275.9	316.6
Taiwan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	53.2	14.9	156.5	48.3
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	14.1	50.8	79.1	172.1
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	18.7	7.5	56.5	16.1
South Korea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	$ 15.5	$ 24.6	$ 49.2	$ 103.9

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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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