DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Additional Information (Detail) (USD $) In Thousands, except Share data in Millions, 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	Sep. 29, 2013	Sep. 30, 2012
Basis of Presentation [Line Items]
Document Fiscal Year Focus									2014
Stock awards excluded from computation of diluted EPS									2.8	1.8	5.1
Net income	$ 32,797	$ (4,293)	$ (6,759)	$ 1,379	$ 14,086	$ 18,279	$ (2,905)	$ 14,214	$ 23,123	$ 43,674	$ (29,675)
International
Basis of Presentation [Line Items]
Percentage of net sales from international market									47.00%	47.00%	50.00%
Defense And Security
Basis of Presentation [Line Items]
Concentration of credit risk in major customer									27.00%
Internal Revenue Service (IRS) | Minimum
Basis of Presentation [Line Items]
Open tax years by major tax jurisdiction									2007
Internal Revenue Service (IRS) | Maximum
Basis of Presentation [Line Items]
Open tax years by major tax jurisdiction									2013
Foreign Country | Minimum
Basis of Presentation [Line Items]
Open tax years by major tax jurisdiction									2010
Foreign Country | Maximum
Basis of Presentation [Line Items]
Open tax years by major tax jurisdiction									2013
Performance stock units
Basis of Presentation [Line Items]
Vesting percentage relative to net sales									40.00%	25.00%	50.00%
Vesting percentage relative to earnings per share									60.00%	75.00%	50.00%