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Restructuring (Detail Textuals 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 31, 2013 General and administrative expense	Jan. 31, 2012 General and administrative expense	Jan. 31, 2013 Severance	Jan. 31, 2012 Severance	Jan. 31, 2013 Employee Relocation	Jan. 31, 2012 Employee Relocation
Restructuring Cost and Reserve [Line Items]
Restructuring-related costs	$ 1,000	$ 3,100	$ 572	$ 1,100	$ 700	$ 2,000

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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