Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jul. 31, 2019	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Goodwill And Intangible Assets [Line Items]
Loss on Impairment	$ 0		$ 15,502
Long lived assets Impairment charge	$ 0
Goodwill before impairment charge			24,300
Goodwill		$ 9,775	8,753	$ 25,579
Accumulated goodwill impairment charges		54,800	54,800
Building carrying value, Ending balance		11,177	20,990
Intangible assets, Beginning balance		300
Impairment of Intangible Assets		300
Intangible assets, Ending balance		0	300
Amortization expense		1,163	896
Computer Software, Intangible Asset
Goodwill And Intangible Assets [Line Items]
Net book value		0	0
Cost of Revenue [Member]
Goodwill And Intangible Assets [Line Items]
Amortization expense			28
Service [Member] | Cost of Revenue [Member] | Computer Software, Intangible Asset
Goodwill And Intangible Assets [Line Items]
Amortization expense		0	700
Buildings [Member]
Goodwill And Intangible Assets [Line Items]
Long lived assets Impairment charge		1,200
Building carrying value, Beginning balance		4,700
Building impairment Charges		1,200
Building carrying value, Ending balance		$ 3,500	$ 3,467