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Segment, Customers, and Geographic Information - Net Revenue from External Customers (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Revenue from External Customer [Line Items]
Net revenue	$ 430.4	$ 461.3	$ 847.8	$ 847.5
Mobile Product Applications [Member]
Revenue from External Customer [Line Items]
Net revenue	261.8	376.6	554.7	690.6
PC Product Applications [Member]
Revenue from External Customer [Line Items]
Net revenue	61.7	63.8	127.0	118.7
Internet of Things Product Applications [Member]
Revenue from External Customer [Line Items]
Net revenue	$ 106.9	$ 20.9	$ 166.1	$ 38.2

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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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