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PENSION PLANS - Net Periodic Pension Costs (Details) - USD ($)
$ in Thousands
12 Months Ended
Jul. 29, 2017
Jul. 30, 2016
Jul. 25, 2015
Compensation Related Costs [Abstract]      
Service cost $ 388 $ 3,099 $ 3,642
Interest cost on projected benefit obligation 2,424 3,031 3,055
Expected return on plan assets (3,684) (3,645) (3,719)
Loss (gain) on settlement 965 0 (239)
Amortization of gains and losses 1,343 1,504 1,295
Net periodic pension cost $ 1,436 $ 3,989 $ 4,034