Restructuring and Other Charges - Narrative (Details) employee in Thousands, $ in Millions		3 Months Ended
	Sep. 30, 2019 USD ($) employee	Jan. 31, 2022 USD ($)	Jan. 31, 2021 USD ($)
Restructuring Cost and Reserve [Line Items]
Other charges		$ 1	$ 4
Fiscal 2020 Plan
Restructuring Cost and Reserve [Line Items]
Estimated pre-tax charges	$ 1,000
Minimum | Fiscal 2020 Plan
Restructuring Cost and Reserve [Line Items]
Expected positions to be eliminated | employee	7
Maximum | Fiscal 2020 Plan
Restructuring Cost and Reserve [Line Items]
Expected positions to be eliminated | employee	9
Severance and EER | Fiscal 2020 Plan
Restructuring Cost and Reserve [Line Items]
Estimated pre-tax charges	$ 800