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Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2013
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2014	$ 23,162
2015	18,493
2016	15,343
2017	13,953
2018	12,168
Thereafter	48,060
Operating leases, future minimum payments due	131,179
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2014	229
2015	62
2016	6
2017
2018
Thereafter
Capital leases, future minimum payments due	297
Less amount representing interest	(8)
Capital leases, future minimum payments, present value of net minimum payments	$ 289

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