Industry Segment Operations (Details 2)	3 Months Ended
	Apr. 29, 2012
Samsung Electronics Co., Ltd. [Member]
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]
Accounted net sales in percent	30.00%
Taiwan Semiconductor Manufacturing Company Limited [Member]
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]
Accounted net sales in percent	13.00%