Contingencies (Details) - Maximum	Jul. 31, 2020 USD ($)
Loss Liability [Member]
Loss Contingencies [Line Items]
Self insurance retention	$ 30,000,000
Automobile Liability Loss [Member]
Loss Contingencies [Line Items]
Self insurance retention	50,000
Workers compensation Liability Insurance [Member]
Loss Contingencies [Line Items]
Self insurance retention	250,000
Product and General Liability Insurance [Member]
Loss Contingencies [Line Items]
Self insurance retention	$ 250,000