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Acquisitions - Summary of Unaudited Pro Forma Financial Information Presents Combined Results of Operations (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Conexant Systems, LLC [Member]
Business Acquisition [Line Items]
Revenue	$ 394.0	$ 469.1	$ 1,249.9	$ 1,372.0
Net income/(loss)	$ (13.8)	$ (0.4)	$ (122.4)	$ 19.8
Net income/(loss) per share	$ (0.40)	$ (0.01)	$ (3.60)	$ 0.57
Marvell Technology Group Ltd [Member]
Business Acquisition [Line Items]
Revenue	$ 394.0	$ 469.1	$ 1,345.2	$ 1,367.1
Net income/(loss)	$ (13.7)	$ 15.0	$ (121.3)	$ 19.8
Net income/(loss) per share	$ (0.40)	$ 0.45	$ (3.57)	$ 0.58

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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.

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- Definition

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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