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Schedule of Future Minimum Rental Payments for Operating Leases Having Non-Cancelable Lease Periods in Excess of One Year (Detail) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2013
Operating Leased Assets [Line Items]
2014	$ 34,724
2015	29,715
2016	29,050
2017	26,101
2018	20,735
Thereafter	81,336
Operating Leases, Future Minimum Payments Due, Total	$ 221,661

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