Income Taxes - Additional Information (Detail) - USD ($)	11 Months Ended	12 Months Ended
	Dec. 31, 2017	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017
Income Taxes [Line Items]
Statutory tax rate	35.00%	21.00%	21.00%	33.80%
Deferred tax liabilities, not recognized		$ 11,900,000
Cumulative undistributed earnings of foreign subsidiaries		78,500,000
Gross deferred tax assets, net of deferred tax liabilities before valuation allowance		23,800,000	$ 21,800,000
Deferred tax assets		12,556,000	10,799,000
Valuation allowance		14,670,000	12,526,000
Unrecognized tax benefits		42,695,000	37,531,000	$ 34,117,000	$ 37,977,000
Unrecognized tax benefits that would impact effective tax rate		36,200,000
Interest expense and penalties related to uncertain tax positions		358,000	263,000	$ 37,000
Noncurrent liabilities related to interest and penalties for uncertain tax positions		760,000	403,000
Long term income taxes payable, including estimated interest and penalties		$ 8,300,000
U.S. federal tax authorities [Member] | Earliest tax year [Member]
Income Taxes [Line Items]
Income tax examination, year		2013
U.S. federal tax authorities [Member] | Latest tax year [Member]
Income Taxes [Line Items]
Income tax examination, year		2019
U.S. state tax authorities [Member] | Earliest tax year [Member]
Income Taxes [Line Items]
Income tax examination, year		2009
U.S. state tax authorities [Member] | Latest tax year [Member]
Income Taxes [Line Items]
Income tax examination, year		2019
Foreign tax authorities [Member] | Earliest tax year [Member]
Income Taxes [Line Items]
Income tax examination, year		2014
Foreign tax authorities [Member] | Latest tax year [Member]
Income Taxes [Line Items]
Income tax examination, year		2019
Other Long-Term Liabilities [Member]
Income Taxes [Line Items]
Income tax liabilities considered as other long term liabilities		$ 7,500,000	$ 6,300,000
Federal [Member]
Income Taxes [Line Items]
Net operating loss carryforwards		$ 81,300,000
Net operating loss carryforwards begin to expire in fiscal year		2035
Research and development credit carryforwards		$ 20,400,000
Federal credits begin to expire in fiscal year		2033
California state [Member]
Income Taxes [Line Items]
Net operating loss carryforwards		$ 15,700,000
Net operating loss carryforwards begin to expire in fiscal year		2035
Research and development credit carryforwards		$ 23,200,000
Research and Development [Member] | Federal [Member]
Income Taxes [Line Items]
Deferred tax assets		$ 8,000,000.0