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Commitments and Contingencies (Details Textuals) - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2017
Major Operating and Capital Expenses [Abstract]
Outstanding letter of credit	$ 25.1
Facilities Rental Expense
Major Operating and Capital Expenses [Abstract]
Rental expense	30.6	$ 45.6	$ 26.8
Yard Operations Equipment Rental Expense
Major Operating and Capital Expenses [Abstract]
Rental expense	$ 1.8	$ 2.8	$ 2.9

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- References

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- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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