Income Taxes (Details 3) - USD ($) $ in Thousands	Jul. 31, 2018	Jul. 31, 2017
Deferred tax assets:
Allowance for doubtful accounts	$ 1,068	$ 1,177
Accrued compensation and benefits	17,704	26,621
State taxes	580	215
Accrued other	1,930	2,684
Deferred revenue	(929)	371
Property and equipment	0	9,405
Losses carried forward	3,065	3,688
Federal tax benefit	6,441	10,542
Total gross deferred tax assets	31,717	53,961
Less: Valuation allowance	(4,592)	(6,455)
Net deferred tax assets	27,125	47,506
Deferred tax liabilities:
Vehicle pooling costs	(6,523)	(9,590)
Deferred Tax Liabilities, Property, Plant and Equipment	(14,147)	0
Prepaid insurance	(708)	(1,333)
Intangibles and goodwill	(25,010)	(38,580)
Deferred Tax Liabilities, Gross	(46,388)	(49,503)
Total gross deferred tax liabilities	(19,263)	(1,997)
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 16,000	$ 13,000