Major Customers and Export Sales - Foreign Revenues by Country as Percentage of Total Foreign Revenue (Detail)	3 Months Ended	6 Months Ended		3 Months Ended
	Mar. 28, 2015	Mar. 28, 2015	Mar. 29, 2014	Mar. 29, 2014
Egypt [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from foreign countries as a percentage of foreign revenue	97.00%	93.00%
Colombia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from foreign countries as a percentage of foreign revenue			89.00%
Saudi Arabia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from foreign countries as a percentage of foreign revenue			11.00%	100.00%
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from foreign countries as a percentage of foreign revenue	3.00%	7.00%