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Basis of Presentation - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Mar. 30, 2013
Service and Other Revenues [Member]
 
Organization Consolidation And Presentation Of Financial Statements [Line Items]  
Reclassification value $ 3.8
Cost of Service and Other Revenues [Member]
 
Organization Consolidation And Presentation Of Financial Statements [Line Items]  
Reclassification value $ 2.2