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Restructuring (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Oct. 31, 2013	Oct. 31, 2012
Severance
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 1,569
General and administrative
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	1,627	286
General and administrative \| Severance
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	1,569	286
General and administrative \| Relocation
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	58
Yard operations
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	18	39
Yard operations \| Severance
Restructuring Cost and Reserve [Line Items]
Restructuring Charges
Yard operations \| Relocation
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 18	$ 39

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References+ Details