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8. Fair Value Measurements (Details) - Pension Plan [Member]
3 Months Ended
Oct. 28, 2018
USD ($)
8. Fair Value Measurements (Details) [Line Items]  
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Assets Transferred to (from) Plan $ 3,000,000
Assets for Plan Benefits, Defined Benefit Plan $ 617,000