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Restructuring (Details Textuals) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jul. 31, 2012	Jul. 31, 2011
Restructuring Cost and Reserve [Line Items]
Restructuring-related costs	$ 2.2	$ 1.4
Impairment of long-lived assets
Restructuring Cost and Reserve [Line Items]
Restructuring-related costs	1.1
Yard operations expense
Restructuring Cost and Reserve [Line Items]
Restructuring-related costs	0.8
Severance
Restructuring Cost and Reserve [Line Items]
Restructuring-related costs	1.7	1.2
Employee Relocation
Restructuring Cost and Reserve [Line Items]
Restructuring-related costs	$ 2.4	$ 0.2

Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

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