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Customer Concentration and Revenue Information (Tables)
 12 Months Ended
Jan. 25, 2025
Revenue from Contract with Customer [Abstract]  
Customer Credit Concentration Customers whose contract revenues exceeded 10% of total contract revenues during fiscal 2025, fiscal 2024, or fiscal 2023, as well as total contract revenues from all other customers combined, were as follows:
Fiscal Year Ended
January 25, 2025January 27, 2024January 28, 2023
Amount% of TotalAmount% of TotalAmount% of Total
AT&T Inc. $942.8 20.1 %$706.5 16.9 %$958.0 25.2 %
Lumen Technologies570.4 12.1 %650.6 15.6 %483.5 12.7 %
Comcast Corporation401.6 8.5 %448.6 10.7 %430.6 11.3 %
Total other customers combined2,787.2 59.3 %2,369.9 56.8 %1,936.4 50.8 %
Total contract revenues$4,702.0 100.0%$4,175.6 100.0%$3,808.5100.0%
Total contract revenues by customer type during fiscal 2025, fiscal 2024, and fiscal 2023, were as follows (dollars in millions):
Fiscal Year Ended
January 25, 2025January 27, 2024January 28, 2023
Amount% of TotalAmount% of TotalAmount% of Total
Telecommunications$4,250.2 90.4%$3,743.3 89.6%$3,415.8 89.7%
Underground facility locating314.7 6.7%295.3 7.1%274.9 7.2%
Electrical and gas utilities and other137.1 2.9%137.0 3.3%117.8 3.1%
Total contract revenues$4,702.0 100.0%$4,175.6 100.0%$3,808.5 100.0%