Net Sales by the Originating Geographic Area and Estimated End Market (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 28, 2014	Jun. 29, 2014	Mar. 30, 2014	Dec. 29, 2013	Sep. 29, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 30, 2012	Sep. 28, 2014 segment	Sep. 29, 2013	Sep. 30, 2012
Segment Reporting Disclosure [Line Items]
Number of Reportable Segments									1
Net Sales	$ 303,315	$ 292,301	$ 287,016	$ 255,631	$ 250,383	$ 242,630	$ 235,333	$ 247,598	$ 1,138,263	$ 975,944	$ 1,012,495
Aerospace
Segment Reporting Disclosure [Line Items]
Net Sales									169,613	187,006	212,293
Communication
Segment Reporting Disclosure [Line Items]
Net Sales									407,593	278,126	311,952
Defense And Security
Segment Reporting Disclosure [Line Items]
Concentration of credit risk in major customer									27.00%
Net Sales									302,714	306,311	286,430
Industrial
Segment Reporting Disclosure [Line Items]
Net Sales									258,343	204,501	201,820
United States
Segment Reporting Disclosure [Line Items]
Net Sales									604,358	514,632	501,257
Europe
Segment Reporting Disclosure [Line Items]
Net Sales									163,669	142,343	165,942
Asia
Segment Reporting Disclosure [Line Items]
Concentration of credit risk in major customer									10.00%	10.00%	11.00%
Net Sales									338,448	292,589	320,430
Other Geographical [Member]
Segment Reporting Disclosure [Line Items]
Net Sales									$ 31,788	$ 26,380	$ 24,866