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Restructuring (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2014	Jan. 31, 2013
Severance
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			$ 4,772
General and administrative
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	3,228	793	4,855	1,079
General and administrative \| Severance
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	3,203	286	4,772	572
General and administrative \| Relocation
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	25	507	83	507
Yard operations
Restructuring Cost and Reserve [Line Items]
Restructuring Charges		162		202
Yard operations \| Severance
Restructuring Cost and Reserve [Line Items]
Restructuring Charges
Yard operations \| Relocation
Restructuring Cost and Reserve [Line Items]
Restructuring Charges		$ 162		$ 202

- 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