Goodwil, Long-lived Assets, and Other Charges - Goodwill Narrative (Details) $ in Thousands	12 Months Ended
Jan. 31, 2020 USD ($) ReportingUnits	Jan. 31, 2019 USD ($) ReportingUnits	Jan. 31, 2018 USD ($) ReportingUnits
Goodwill [Line Items]
Number reporting units for Goodwill impairment analysis \| ReportingUnits	4	3	3
Operating Income (Loss)
Goodwill [Line Items]
Goodwill impairment loss	$ 0	$ 0	$ 0
Aerostar
Goodwill [Line Items]
Amount of estimated fair value that exceeded the net book value		$ 11,600
Percentage of fair value in excess of carrying amount		41.00%
Goodwill impairment loss			$ 0

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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