Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Successor Company Warrants (Details)

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Fair Value Measurements - Successor Company Warrants (Details)
 3 Months Ended 4 Months Ended 5 Months Ended 7 Months Ended 8 Months Ended 12 Months Ended
Apr. 30, 2020
Jun. 11, 2021
Jan. 31, 2021
Aug. 27, 2020
Jan. 31, 2022
Jan. 31, 2022
Jan. 31, 2021
Jan. 31, 2020
Fair Value Measurement Inputs and Valuation Techniques [Line Items]                
Financial Designation, Predecessor and Successor [Fixed List] Predecessor Predecessor Predecessor Predecessor Successor Successor Predecessor Predecessor
Risk-free interest rates                
Fair Value Measurement Inputs and Valuation Techniques [Line Items]                
Measurement input   0.76     1.54 1.54    
Volatility                
Fair Value Measurement Inputs and Valuation Techniques [Line Items]                
Measurement input   31     43 43    
Expected lives (years)                
Fair Value Measurement Inputs and Valuation Techniques [Line Items]                
Measurement input   5.0     4.4 4.4    
Value per unit                
Fair Value Measurement Inputs and Valuation Techniques [Line Items]                
Measurement input   2.80     1.73 1.73