Quarterly report pursuant to Section 13 or 15(d)

Stock-based compensation - Assumptions for grant date fair value of the stock options (Details)

v3.21.2
Stock-based compensation - Assumptions for grant date fair value of the stock options (Details) - $ / shares
1 Months Ended 2 Months Ended 3 Months Ended 4 Months Ended 6 Months Ended 12 Months Ended
Jun. 12, 2021
Jun. 11, 2021
Jul. 31, 2021
Jul. 31, 2021
Apr. 30, 2021
Jul. 31, 2020
Apr. 30, 2020
Jun. 11, 2021
Jul. 31, 2021
Jul. 31, 2020
Jan. 31, 2021
Jan. 31, 2020
Assumptions for grant date fair value of the stock options                        
Financial Designation, Predecessor and Successor [Fixed List] Successor Predecessor Successor Successor Predecessor Predecessor Predecessor Predecessor Successor Predecessor Predecessor Predecessor
Stock Options                        
Assumptions for grant date fair value of the stock options                        
Risk-free interest rates       0.98%                
Volatility factor       30.00%                
Expected lives (years)       6 years 1 month 6 days                
Weighted average fair value of options granted       $ 3.34