Major Customers and Export Sales - Foreign Revenue, as Percentage of Total Foreign Revenue by Geographic Area (Detail)	3 Months Ended		6 Months Ended
	Mar. 28, 2015	Mar. 29, 2014	Mar. 28, 2015	Mar. 29, 2014
Central and South America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from geographical area as a percentage of foreign revenue				89.00%
Mid-East and Africa [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from geographical area as a percentage of foreign revenue	97.00%	100.00%	94.00%	11.00%
Far East [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from geographical area as a percentage of foreign revenue	3.00%		6.00%