Organization and Significant Accounting Policies (Narrative) (Details) (USD $)	12 Months Ended																	1 Months Ended			0 Months Ended	1 Months Ended
	Sep. 30, 2013 Business_Segment	Sep. 30, 2013 Largest Distributor Sales Revenue, Goods, Net Customer Concentration Risk	Sep. 30, 2012 Largest Distributor Sales Revenue, Goods, Net Customer Concentration Risk	Sep. 30, 2011 Largest Distributor Sales Revenue, Goods, Net Customer Concentration Risk	Sep. 30, 2013 Second Largest Distributor Sales Revenue, Goods, Net Customer Concentration Risk	Sep. 30, 2012 Second Largest Distributor Sales Revenue, Goods, Net Customer Concentration Risk	Sep. 30, 2011 Second Largest Distributor Sales Revenue, Goods, Net Customer Concentration Risk	Sep. 30, 2013 Selling, general and administrative	Sep. 30, 2012 Selling, general and administrative	Sep. 30, 2011 Selling, general and administrative	Sep. 30, 2013 Minimum	Sep. 30, 2013 Maximum	Sep. 30, 2013 Property and equipment Minimum	Sep. 30, 2013 Property and equipment Maximum	Sep. 30, 2013 Buildings and leasehold improvements Minimum	Sep. 30, 2013 Buildings and leasehold improvements Maximum	Sep. 30, 2013 Wafer and Die Bank	Aug. 31, 2011 Giantec Semiconductor, Inc	Aug. 31, 2011 Giantec Semiconductor, Inc	Dec. 30, 2010 Giantec Semiconductor, Inc	Dec. 30, 2010 Giantec Semiconductor, Inc	Jan. 31, 2010 Co-venturer Giantec Semiconductor, Inc
Entity Information [Line Items]
Cost-method Investments, Realized Gain (Loss)	$ 200,000
Proceeds from formation of Giantec																						3,800,000
Investment received from outside investors																					4,000,000
Ownership interest																				44.00%
Ownership percentage sold in Giantec																			37.00%
Ownership percentage in Giantec after sale																		19.85%
Proceeds from Sale of Other Investments	4,300,000
Cash and cash equivalents maturity period	90 days
Inventory aging period	1 year																2 years
Property, equipment and leasehold improvements useful life (years)													2 years	10 years	25 years	50 years
Estimated useful lives of purchased definite lived intangible assets											6 months	8 years
Advertising costs								$ 79,000	$ 59,000	$ 57,000
Option vesting term (years)	4 years
Business segment	1
Concentration Risk, largest customers (percentage)		17.00%	14.00%	15.00%	11.00%	13.00%	12.00%
Period of product warranty (months)	12 months