Goodwill and Other Intangible Assets - Discount Rates (Details) - Discount Rates	Oct. 31, 2020
Valuation, Market Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Reporting unit, measurement input	0.150
Education | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Reporting unit, measurement input	0.100
Aviation | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Reporting unit, measurement input	0.105
Technical Solutions | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Reporting unit, measurement input	0.110