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Schedule by Year of Future Minimum Lease Payments for Operating Leases with Original Terms in Excess of One Year (Detail) (USD $)
In Thousands, unless otherwise specified
Jan. 31, 2013
Schedule of Operating Leases [Line Items]  
2014 $ 217,726
2015 217,518
2016 198,504
2017 174,442
2018 157,658
Thereafter 597,916
Total minimum lease payments $ 1,563,764