Stock-Based Compensation - Schedule of Restricted Stock Activity (Details) - Restricted Stock Units	3 Months Ended
	Apr. 30, 2020 $ / shares shares
Number of RSUs
Balance at beginning of period (in shares) | shares	38,583,994
Granted (in shares) | shares	5,500,804
Canceled (in shares) | shares	(1,638,338)
Vested and converted to shares (in shares) | shares	(5,851,821)
Balance at end of period (in shares) | shares	36,594,639
Weighted-Average Grant Date Fair Value Per Share
Balance at beginning of period (in dollars per share) | $ / shares	$ 10.85
Granted (in dollars per share) | $ / shares	9.00
Canceled (in dollars per share) | $ / shares	11.24
Vested and converted to shares (in dollars per share) | $ / shares	9.81
Balance at end of period (in dollars per share) | $ / shares	$ 10.72