Supplemental Financial Information (Details Textual) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	1 Months Ended		3 Months Ended		9 Months Ended					3 Months Ended		9 Months Ended		1 Months Ended		6 Months Ended	3 Months Ended	9 Months Ended		3 Months Ended			9 Months Ended		3 Months Ended	9 Months Ended
	Mar. 31, 2010	Mar. 31, 2006	Jun. 29, 2012	Mar. 30, 2012	Jun. 29, 2012	Sep. 30, 2011	May 27, 2011	Apr. 19, 2011	Mar. 01, 2011	Jul. 01, 2011 Successor [Member]	Jun. 29, 2012 Successor [Member]	Jun. 29, 2012 Successor [Member]	Sep. 30, 2011 Successor [Member]	Apr. 19, 2011 Predecessor [Member]	Apr. 19, 2011 Predecessor [Member]	Apr. 19, 2011 Predecessor [Member]	Mar. 30, 2012 Impairment of goodwill [Member]	Jun. 29, 2012 Research and Development Arrangement [Member]	Jun. 29, 2012 Trade name [Member]	Jun. 29, 2012 Customer relationships [Member]	Jun. 29, 2012 Customer relationships [Member] Successor [Member]	Sep. 30, 2011 Customer relationships [Member] Successor [Member]	Jun. 29, 2012 Warrant [Member]	Jun. 29, 2012 Senior secured notes [Member]	Jul. 01, 2011 Senior secured notes [Member] Successor [Member]	Jun. 29, 2012 Maximum [Member]	Jun. 29, 2012 Minimum [Member]
Supplemental Financial Information (Textual) [Abstract]
Increase(Decrease) in Net inventory			$ 300,000		$ 300,000	$ 1,200,000
Fair value of the project			1,900,000		1,900,000
Amortized expense period			5 years		5 years
Impairment charges											0	900,000					31,500,000	6,000,000	1,100,000	15,400,000
Carrying value																					31,172,000	50,300,000
Historical carrying value				2,800,000							11,734,000	11,734,000	30,125,000								6,387,000	26,490,000
Expiration Date for Warrant					June 2013
Weighted-average remaining period					P5Y8M12D
Debt Instrument, Maturity Date																								Mar. 15, 2015
Premium amount of senior secured notes			14,604,000		14,604,000	18,121,000
Amortization over estimated useful lives with no residual value																										8 years	6 months
Amortization of intangible assets										4,826,000	1,266,000	5,319,000		53,000		621,000
Purchase shares of Mindspeed common stock			6.1		6.1
Warrants, fair value disclosure			4,000		4,000	1,700,000
Warrants, Expected life (years)												1 year	1 year 9 months										1 year
Aggregate principal amount of senior secured notes	175,000,000
Rate of senior notes sold	99.06%
Proceeds from Issuance of Senior Long-term Debt	173,400,000
Discount	1,600,000
Deferred debt offering	4,900,000
Debt instrument unamortized discounts	3,800,000
Senior notes accrue interest	11.25%
Redemption price of principle amount of the senior notes on or after March 15, 2013 during 2013	105.625%
Redemption price of principle amount of the senior notes after 2013	100.00%
Redemption price of principle amount of the senior notes before March 15, 2013	100.00%
Redemption percentage of the original aggregated principle amount of the senior notes from January 1, 2011 to March 15, 2013	35.00%
Redemption price of the original aggregated principle amount of the senior notes from January 1, 2011 to March 15, 2013.	111.25%
Senior notes at a repurchase price				100.00%
Company offerings for the repurchase of senior notes at a repurchase price							101.00%
Repurchase the senior notes for an aggregate							176,750,000
Senior notes were valued at par								111.50%
Senior notes par value								195,100,000
Senior notes premium								20,100,000
Interest expense of senior secured notes due										3,000,000	3,800,000	11,400,000		1,100,000		11,600,000
Amortization of the premium/discount of senior secured notes										(876,000)	(1,200,000)	(3,517,000)			20,000	419,000									(900,000)
Total Amortization of the premium/discount												3,517,000,000
Principal amount of convertible notes		200,000,000
Additional amount of Principle		50,000,000
Net of issuances		243,600,000
Conversion price of common stock		$ 49.20
Convertible notes redemption price of principle amount, plus accrued and unpaid interest, beginning March 1, 2011		100.00%
Convertible notes repurchase price of principle amount, plus accrued and unpaid interest		100.00%
Company redeemed convertible notes									11,200,000
Debt convertible Interest Expense																400,000
Debt discount amortization on convertible notes																$ 200,000