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Restructuring and other exit costs, net (Narrative) (Details) - Scenario, Forecast - Fiscal 2018 Plan | 12 Months Ended
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Jan. 31, 2019 Position
Restructuring Cost and Reserve [Line Items] |
Expected termination of workforce, percent | 13.00%
Restructuring, number of positions eliminated | 1,150

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- Definition The number of positions eliminated during the period as a result of restructuring activities. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition The number of positions eliminated during the period as a percentage of total positions eliminated during the period in connection with the restructuring plan(s). + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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- Details
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Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
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Period Type: |