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Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2012
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2013	$ 17,208
2014	13,684
2015	11,156
2016	9,184
2017	7,655
Thereafter	46,396
Operating leases, future minimum payments due	105,283
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2013	198
2014	126
2015
2016
2017
Thereafter
Capital Leases, Future Minimum Payments Due	324
Less amount representing interest	(17)
Capital leases, future minimum payments, present value of net minimum payments	$ 307

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