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Accounts receivable - Credit Quality Indicator and Age Analysis (Details) - USD ($) $ in Millions | Feb. 03, 2018 | Jul. 29, 2017
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross | $ 762.9 | $ 1,792.5
Valuation allowance | $ (113.5) | $ (135.0)
Valuation allowance | 14.90% | (7.50%)
Financing Receivables, 0 to 120 Days Past Due | Performing Financing Receivable |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross | $ 703.4 |
Valuation allowance | (54.0) |
Financing Receivables, 121 Or More Days Past Due | Performing Financing Receivable |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross | 59.5 |
Valuation allowance | $ (59.5) |
Current, aged 0 – 30 days | Performing Financing Receivable |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross |  | $ 1,394.2
Valuation allowance |  | (42.8)
Past due, aged 31 – 60 days | Performing Financing Receivable |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross |  | 264.6
Valuation allowance |  | (8.6)
Past due, aged 61 – 90 days | Performing Financing Receivable |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross |  | 52.5
Valuation allowance |  | (2.4)
Past due, aged more than 90 days | Nonperforming Financing Receivable |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross |  | 81.2
Valuation allowance |  | $ (81.2)

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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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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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