Basis of Presentation and Summary of Significant Accounting Policies (Tables)

3 Months Ended

Apr. 30, 2019

Accounting Policies [Abstract]

Deferred Commissions

Changes in total deferred commissions during the periods presented are as follows (in thousands):

	Three Months Ended April 30,
	2018			2019
Beginning balance	$	87,313		$	114,973
Additions	15,421			18,236
Recognition of deferred commissions	(16,690		)	(19,952		)
Ending balance	$	86,044		$	113,257

Deferred Revenue

Changes in total deferred revenue during the periods presented are as follows (in thousands):

	Three Months Ended April 30,
	2018			2019
Beginning balance	$	374,102		$	535,920
Additions	75,271			117,894
Recognition of deferred revenue	(60,759		)	(89,584		)
Ending balance	$	388,614		$	564,230