Fair Value Measurements - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Oct. 31, 2022	Apr. 30, 2022	Oct. 31, 2022	Jan. 31, 2022	Jun. 30, 2019	Jan. 31, 2018
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Other investments	$ 10,900,000		$ 10,900,000	$ 5,000,000
Fair value measurements recurring \| Non-marketable debt investments
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Other investments	2,653,000		2,653,000	6,434,000
Level 3 \| Fair value measurements recurring \| Non-marketable debt investments
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Other investments	2,653,000		2,653,000	6,434,000
Impairments	0		0
Unrealized gain		$ 1,300,000
Level 2 \| Fair value measurements recurring \| Non-marketable debt investments
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Other investments	0		0	0
0.375% Convertible Senior Notes Due 2026
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt instrument, principal amount	$ 1,380,000,000		$ 1,380,000,000	1,380,000,000
Debt instrument, interest rate	0.375%		0.375%
0.375% Convertible Senior Notes Due 2026 \| Level 2
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Estimated fair value of convertible notes	$ 1,098,500,000		$ 1,098,500,000	1,277,100,000
0.125% Convertible Senior Notes Due 2025
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt instrument, principal amount	$ 804,990,000		$ 804,990,000	804,990,000	$ 805,000,000.0
Debt instrument, interest rate	0.125%		0.125%		0.125%
0.125% Convertible Senior Notes Due 2025 \| Level 2
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Estimated fair value of convertible notes	$ 691,100,000		$ 691,100,000	895,000,000
0.375% Convertible Senior Notes Due 2023
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt instrument, principal amount	$ 2,000		$ 2,000	1,752,000		$ 230,000,000.0
Debt instrument, interest rate	0.375%		0.375%			0.375%
0.375% Convertible Senior Notes Due 2023 \| Level 2
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Estimated fair value of convertible notes	$ 0		$ 0	$ 5,300,000

Coupa Software Inc 10-Q