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Acquisition (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Sep. 28, 2012
Sep. 30, 2011
Oct. 01, 2010
Sep. 28, 2012
Waypoint And Pro Map Technologies Inc. [Member]
Jul. 11, 2011
Waypoint And Pro Map Technologies Inc. [Member]
Business Acquisition [Line Items]          
Business acquisition, acquisition date       Jul. 11, 2011  
Cash paid for business acquisition         $ 4,000
Business acquisition, acquired bathymetry database value         2,000
Business acquisition, recognized goodwill $ 14,466 $ 14,651 $ 13,729   $ 732