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Goodwil, Long-lived Assets, and Other Charges - Goodwill Narrative (Details) $ in Thousands	3 Months Ended	9 Months Ended		12 Months Ended
	Jan. 31, 2020 USD ($) ReportingUnits	Oct. 31, 2020 ReportingUnits	Oct. 31, 2019 ReportingUnits	Jan. 31, 2021 USD ($)	Jan. 31, 2020 USD ($)	Jan. 31, 2019 USD ($) ReportingUnits
Goodwill [Line Items]
Number reporting units for Goodwill impairment analysis \| ReportingUnits	4	4	3			3
Goodwill	$ 106,509			$ 107,677	$ 106,509	$ 50,942
Operating Income (Loss)
Goodwill [Line Items]
Goodwill impairment loss				0	0	0
Applied Technology
Goodwill [Line Items]
Goodwill	$ 72,643			$ 73,811	$ 72,643	$ 17,076
Applied Technology \| Autonomy
Goodwill [Line Items]
Percentage of fair value in excess of carrying amount				20.00%
Goodwill				$ 56,613