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Income taxes - Reconciliation of Statutory Tax Rate to Effective Tax Rate (Details) | 6 Months Ended
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Jul. 31, 2021 | Aug. 01, 2020
Income Tax Disclosure [Abstract] |  |
Estimated annual effective tax rate before discrete items | 21.40% | 22.30%
Discrete items recognized | (15.50%) | 8.90%
Effective tax rate recognized in statements of operations | 5.90% | 31.20%

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- Definition Expected Effective Income Tax Rate Reconciliation, Percent + References No definition available. + Details
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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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- Definition Percentage of the difference, between reported income tax expense (benefit) and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, that is attributable to tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority interest income (expense), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, change in enacted tax rate, prior year income taxes, change in deferred tax asset valuation allowance, and other adjustments. + References No definition available. + Details
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