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Gain on Disposal of Assets (Details) - USD ($)
3 Months Ended 9 Months Ended
Oct. 31, 2020
Nov. 02, 2019
Oct. 31, 2020
Nov. 02, 2019
Gain on disposal of assets        
Proceeds from disposal of assets $ 1.5   $ 1,533,000 $ 22,031,000
Gain on disposal of assets $ (2,221,000) $ (304,000) $ (2,235,000) $ 11,996,000