Stockholders’ Equity (Deficit) (Details)	1 Months Ended	9 Months Ended
	Oct. 31, 2017 $ / shares shares	Oct. 31, 2017 vote $ / shares shares	Jan. 31, 2017 $ / shares shares
Class A Common Stock
Class of Stock [Line Items]
Number of votes per share | vote		1
Common stock authorized (in shares)	1,000,000,000	1,000,000,000	162,500,000
Common stock, par value (in dollars per share) | $ / shares	$ 0.001	$ 0.001	$ 0.001
Common stock issued (in shares)	9,325,098	9,325,098	0
Common stock outstanding (in shares)	9,325,098	9,325,098	0
Class B Common Stock
Class of Stock [Line Items]
Number of votes per share | vote		10
Period of automatic conversion after death of founder		9 months
Percent of outstanding stock		10.00%
Common stock authorized (in shares)	100,000,000	100,000,000	113,000,000
Common stock, par value (in dollars per share) | $ / shares	$ 0.001	$ 0.001	$ 0.001
Common stock issued (in shares)	41,341,283	41,341,283	13,192,992
Common stock outstanding (in shares)	41,241,912	41,241,912	13,093,621
Common Stock
Class of Stock [Line Items]
Conversion of stock, shares converted (in shares)	26,952,887	26,953,404
Common stock outstanding (in shares)	50,567,010	50,567,010	13,093,621