CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income	Accumulated Deficit
Balance (in shares) at Jan. 31, 2019		60,455,381
Balance at Jan. 31, 2019	$ 313,281	$ 6	$ 567,797	$ 335	$ (254,857)
Equity component of Notes, net of issuance costs	246,967		246,967
Purchase Price Of Capped Call Options	(118,738)		(118,738)
Cancellation of common stock issued from acquisitions (in shares)		(7,784)
Issuance of common stock for employee share purchase plan (in shares)		215,472
Issuance of common stock for employee share purchase plan	11,455		11,455
Exercise of stock options (in shares)		2,712,063
Exercise of stock options	17,420	$ 1	17,419
Stock-based compensation expense	82,403		82,403
Vested restricted stock units (in shares)		1,153,838
Temporary equity reclassification	(16,835)		(16,835)
Other comprehensive loss	536			536
Net loss attributable to Coupa Software Incorporated	(90,832)				(90,832)
Balance (in shares) at Jan. 31, 2020		64,528,970
Balance at Jan. 31, 2020	445,657	$ 7	790,468	871	(345,689)
Issuance of common stock for acquisitions (in shares)		2,849,537
Issuance of common stock for acquisitions	668,026		668,026
Equity component of Notes, net of issuance costs	501,053		501,053
Purchase Price Of Capped Call Options	(192,786)		(192,786)
Issuance of common stock for employee share purchase plan (in shares)		209,306
Issuance of common stock for employee share purchase plan	15,631		15,631
Exercise of stock options (in shares)		1,615,784
Exercise of stock options	19,245		19,245
Stock-based compensation expense	150,578		150,578
Vested restricted stock units (in shares)		1,348,975
Settlement of convertible notes (in shares)		2,201,087
Settlement of convertible notes	(385,393)		(385,393)
Deferred tax related to convertible senior notes	(9,588)		(9,588)
Temporary equity reclassification	(369)		(369)
Other comprehensive loss	8,294			8,294
Net loss attributable to Coupa Software Incorporated	(180,117)				(180,117)
Balance (in shares) at Jan. 31, 2021		72,753,659
Balance at Jan. 31, 2021	1,040,231	$ 7	1,556,865	9,165	(525,806)
Issuance of common stock for acquisitions (in shares)		22,370
Issuance of common stock for acquisitions	0		0
Issuance of common stock for employee share purchase plan (in shares)		156,810
Issuance of common stock for employee share purchase plan	21,626		21,626
Exercise of stock options (in shares)		759,390
Exercise of stock options	9,431		9,431
Stock-based compensation expense	200,830		200,830
Vested restricted stock units (in shares)		1,235,810
Settlement of convertible notes (in shares)		132,100
Settlement of convertible notes	(348)		(348)
Temporary equity reclassification	369		369
Other comprehensive loss	478			478
Net loss attributable to Coupa Software Incorporated	(379,039)		(9,933)		(369,106)
Balance (in shares) at Jan. 31, 2022		75,060,139
Balance at Jan. 31, 2022	$ 893,578	$ 7	$ 1,778,840	$ 9,643	$ (894,912)