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Leases (Additional Information) (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jul. 31, 2020 | Jan. 31, 2020
Lessee, Lease, Description [Line Items] |  |
Weighted average remaining lease term (in years) | 7 years 2 months 12 days | 7 years 6 months
Weighted average discount rate (in percentage) | 3.32% | 3.41%
Operating lease minimum payments, executed leases that have not commenced | $ 29.6 |
Minimum |  |
Lessee, Lease, Description [Line Items] |  |
Remaining lease term (in years) | 1 year |
Lease renewal term (in years) | 1 year |
Optional termination period (in years) | 1 year |
Maximum |  |
Lessee, Lease, Description [Line Items] |  |
Remaining lease term (in years) | 70 years |
Lease renewal term (in years) | 10 years |
Optional termination period (in years) | 10 years |

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- Definition Remaining lease term of operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980 + Details
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- Definition Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=121568110&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(3) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 + Details
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