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Commitments And Contingencies (Narrative) (Details) (USD $)
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3 Months Ended | 12 Months Ended | |||||
|---|---|---|---|---|---|---|---|
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Jan. 31, 2012
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Jan. 31, 2011
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Jul. 31, 2009
Synthetic Lease Facility [Member]
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Jan. 31, 2012
Synthetic Lease Facility [Member]
days
years
|
Jan. 31, 2012
Operating Leases [Member]
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Jan. 31, 2011
Operating Leases [Member]
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Jan. 31, 2010
Operating Leases [Member]
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| Loss Contingencies [Line Items] | |||||||
| Rental expense for operating leases | $ 56,500,000 | $ 53,500,000 | $ 55,500,000 | ||||
| Option to purchase leased properties, period in force, years | 4 | ||||||
| Option expiration, days until lease expiration, days | 180 | ||||||
| Residual value guarantee, aggregate amount | 107,400,000 | ||||||
| Future minimum payments | 221,200,000 | 2,700,000 | |||||
| Expiration date | June 2013 | ||||||
| CIDE tax | 32,000,000 | ||||||
| Aggregate amount of guarantees | 65,400,000 | 62,100,000 | |||||
| Aggregate amount of guarantees, outstanding | $ 28,400,000 | $ 43,000,000 | |||||