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Note 12 - Debt (Details Textual) - USD ($) $ in Millions | Jan. 25, 2019 | Jan. 31, 2020 | Jan. 31, 2019 | Jan. 24, 2019
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Letters of Credit Outstanding, Amount |  | $ 0.2 | $ 0.2 |
Revolving Operating Credit Facility [Member] | Senior Secured Credit Facility [Member] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | $ 150.0
Revolving Operating Credit Facility [Member] | Senior Secured Credit Facility [Member] | Minimum [Member] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 350.0 |  |  |
Revolving Operating Credit Facility [Member] | Senior Secured Credit Facility [Member] | Maximum [Member] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 500.0 |  |  |
Line of Credit Borrowings to Support Foreign Exchange and Interest Rate Hedging [Member] | Senior Secured Credit Facility [Member] |  |  |  |
Debt Instrument, Term | 5 years |  |  |
Senior Secured Credit Facility [Member] | Minimum [Member] |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.20% |  |  |
Senior Secured Credit Facility [Member] | Minimum [Member] | Canada or US Prime Rate, BA, or LIBOR [Member] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 0.00% |  |  |
Senior Secured Credit Facility [Member] | Maximum [Member] |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.40% |  |  |
Senior Secured Credit Facility [Member] | Maximum [Member] | Canada or US Prime Rate, BA, or LIBOR [Member] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 2.50% |  |  |

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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