Share-Based Compensation - Summary of Fair Value Assumptions, Market Performance Units (Details) - Market Performance RSUs	12 Months Ended
	Jan. 31, 2021 $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value units granted (in dollars per share)	$ 32.66
Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value units granted (in dollars per share)	29.04
Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value units granted (in dollars per share)	32.94
Chief Executive Officer | Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value units granted (in dollars per share)	44.32
Chief Executive Officer | Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value units granted (in dollars per share)	$ 33.19