Summary of Significant Accounting Policies - Capitalized Software Development Costs (Details) - USD ($)	3 Months Ended
	Oct. 31, 2019	Jan. 31, 2019
Capitalized Software Development Costs
Capitalized software development costs	$ 7,785,000	$ 5,698,000
Capitalized software development costs for software to be sold, leased, or marketed
Capitalized Software Development Costs
Capitalized software development costs	$ 3,470,000	2,921,000
Capitalized software development costs for software to be sold, leased, or marketed | Minimum
Capitalized Software Development Costs
Useful life of asset	3 years
Capitalized software development costs for software to be sold, leased, or marketed | Maximum
Capitalized Software Development Costs
Useful life of asset	5 years
Internal-use software development costs
Capitalized Software Development Costs
Capitalized software development costs	$ 4,153,000	$ 2,565,000
Internal-use software development costs | Minimum
Capitalized Software Development Costs
Useful life of asset	3 years
Internal-use software development costs | Maximum
Capitalized Software Development Costs
Useful life of asset	5 years