| Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block] |
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| | | | | | | | | | | | | | | | April 29,
2017 | | | As previously reported | | Adjustments | | As adjusted | Assets | | |
| | |
| | |
| Accounts receivable | | $ | 39,424 |
| | $ | (864 | ) | | $ | 38,560 |
| Other current assets | | 37,956 |
| | 12,493 |
| | 50,449 |
| Liabilities and stockholders' equity | | |
| | | |
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| Trade accounts payable and accrued expenses | | 1,058,329 |
| | 11,629 |
| | 1,069,958 |
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| | | | | | | | | | | | | | | | February 3,
2018 | | | As previously reported | | Adjustments | | As adjusted | Assets | | |
| | |
| | |
| Accounts receivable | | $ | 39,650 |
| | $ | (1,213 | ) | | $ | 38,437 |
| Other current assets | | 39,612 |
| | 10,747 |
| | 50,359 |
| Liabilities and stockholders' equity | | | | |
| | |
| Trade accounts payable and accrued expenses | | 835,747 |
| | 9,534 |
| | 845,281 |
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| Schedule of AR, Contract Assets and Liabilities - Construction [Table Text Block] |
| | | | | | | | | | | | | | | | | | | | Construction | (in thousands of dollars) | | February 3,
2018 | | May 5,
2018 | | January 28,
2017 | | April 29,
2017 | Accounts receivable | | $ | 20,136 |
| | $ | 26,782 |
| | $ | 30,190 |
| | $ | 26,528 |
| Costs and estimated earnings in excess of billings on uncompleted contracts | | 1,213 |
| | 861 |
| | 922 |
| | 864 |
| Billings in excess of costs and estimated earnings on uncompleted contracts | | 5,503 |
| | 4,665 |
| | 8,826 |
| | 8,007 |
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