v2.4.1.9

INVESTMENT IN EQUITY METHOD INVESTEES (Schedule of Carrying Value of Equity Method Investees) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	May 31, 2014	Dec. 31, 2013	Apr. 30, 2013
Schedule of Equity Method Investments [Line Items]
Carrying value of equity method investees	$ 27,352us-gaap_EquityMethodInvestments		$ 17,843us-gaap_EquityMethodInvestments
Beijing Actions [Member]
Schedule of Equity Method Investments [Line Items]
Carrying value of equity method investees	3,332us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = acts_ActionsMicroelectronicsCoLtdMember		2,856us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = acts_ActionsMicroelectronicsCoLtdMember
Nann Capital [Member]
Schedule of Equity Method Investments [Line Items]
Carrying value of equity method investees	$ 24,020us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = acts_NannCapitalCorporationNannCapitalMember	$ 9,016us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = acts_NannCapitalCorporationNannCapitalMember	$ 14,987us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = acts_NannCapitalCorporationNannCapitalMember	$ 3,712us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = acts_NannCapitalCorporationNannCapitalMember

X

- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.12)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570

+ Details

Name:	us-gaap_EquityMethodInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_ScheduleOfEquityMethodInvestmentsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=acts_ActionsMicroelectronicsCoLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=acts_NannCapitalCorporationNannCapitalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: