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Fair Value Measurements - Narrative (Details) - USD ($)
3 Months Ended 12 Months Ended
Oct. 28, 2018
Oct. 29, 2017
Jan. 27, 2019
Jan. 28, 2018
Jan. 29, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Transfers of financial assets or liabilities between levels     $ 0 $ 0  
Impairment of investments $ 30,000,000 $ 4,300,000 30,000,000 $ 4,250,000 $ 0
Fair value of investment $ 0        
Level 2 | Term loans          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fair value of debt     115,300,000    
Level 2 | Revolving loans          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fair value of debt     $ 97,000,000    
Valuation Technique, Discounted Cash Flow | Measurement Input, Cap Rate          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Investment, measurement input 38.80%