Property and Equipment, Net (Details) - USD ($) $ in Thousands	Jul. 31, 2018	Jul. 31, 2017
Property, Plant and Equipment [Line Items]
Property and equipment	$ 1,653,545	$ 1,396,050
Less: Accumulated depreciation and amortization	(490,120)	(451,994)
Property and equipment, net	1,163,425	944,056
Transportation and other equipment
Property, Plant and Equipment [Line Items]
Property and equipment	190,900	120,420
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Property and equipment	58,477	51,778
Software and Software Development Costs [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	30,680	38,501
Land
Property, Plant and Equipment [Line Items]
Property and equipment	762,524	629,826
Buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment	$ 610,964	$ 555,525