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Segment Reporting - Additional Information (Detail)
3 Months Ended
Apr. 03, 2015
Jan. 02, 2015
Apr. 04, 2014
Segment Reporting Information [Line Items]      
Number of Operating Segments 2us-gaap_NumberOfOperatingSegments    
Percentage of account receivable 10.00%expo_EntityWideAccountReceivableMajorCustomerPercentage 10.00%expo_EntityWideAccountReceivableMajorCustomerPercentage  
Percentage of Company's revenue 10.00%expo_EntityWideSalesRevenueMajorCustomer   10.00%expo_EntityWideSalesRevenueMajorCustomer