Major Customers and Export Sales - Additional Information (Detail)	3 Months Ended		6 Months Ended
	Mar. 28, 2015 Customer Country	Mar. 29, 2014 Customer Country	Mar. 28, 2015 Country Customer	Mar. 29, 2014 Customer Country
Segment Reporting Information [Line Items]
Number of major customers	2	1	3	3
Number of countries in which products are sold	2	1	5	2
Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Segment Reporting Information [Line Items]
Major customers percentage	94.00%	70.00%	87.00%	81.00%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | First Customer [Member]
Segment Reporting Information [Line Items]
Major customers percentage	76.00%		57.00%	46.00%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Second Customer [Member]
Segment Reporting Information [Line Items]
Major customers percentage	18.00%		17.00%	24.00%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Third Customer [Member]
Segment Reporting Information [Line Items]
Major customers percentage			13.00%	11.00%