Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Allowance for doubtful accounts
Allowance for Doubtful Accounts and Allowance for Obsolete Equipment and Inventory [Roll Forward]
Balance at Beginning of Period	$ 2,113	$ 6,167	$ 5,904
Charged to Costs and Expenses	2,000	212	1,027
Charged to Other Accounts	0	0	(23)
Deductions Describe	(59)	(4,266)	(741)
Balance at End of Period	4,054	2,113	6,167
Allowance for obsolete equipment and inventory
Allowance for Doubtful Accounts and Allowance for Obsolete Equipment and Inventory [Roll Forward]
Balance at Beginning of Period	1,222	1,675	952
Charged to Costs and Expenses	298	132	989
Charged to Other Accounts	1	(32)	20
Deductions Describe	(117)	(553)	(286)
Balance at End of Period	$ 1,404	$ 1,222	$ 1,675