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Cost of purchased capped calls.

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The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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The price per share of the conversion feature embedded in the debt instrument.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Date when the debt instrument is scheduled to be fully repaid, in YYYY-MM-DD format.

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The cap rate on a price risk derivative such as a cap or collar. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract.

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The strike price on the price risk option contract such as a put option or a call option.

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Date the credit facility terminates, in YYYY-MM-DD format.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Debt - Additional Information (Details)			1 Months Ended	3 Months Ended
Debt - Additional Information (Details)	Jul. 26, 2021 USD ($)	Nov. 27, 2017	Jan. 31, 2021 USD ($) $ / shares shares	Apr. 30, 2022 USD ($) $ / shares shares	Jan. 31, 2022 USD ($)
Convertible Senior Notes \| 0.00% Convertible Senior Notes Due January 15, 2026
Debt Instrument [Line Items]
Aggregate principal amount			$ 345,000,000.0	$ 345,000,000	$ 345,000,000
Debt instrument interest rate stated percentage			0.00%
Debt instrument due date			Jan. 15, 2026
Principal amount of notes used in conversion rate			$ 1,000
Conversion rate per $1,000 principal amount of notes \| shares			38.7962
Conversion price per share of common stock \| $ / shares			$ 25.78
Debt instrument, effective interest rate				0.56%
Strike price \| $ / shares				25.80
Initial cap prices \| $ / shares				35.58
Common stock shares covered under capped call transactions \| shares				13,400,000
Cost of purchased capped calls				$ 27,800,000
Total debt outstanding with carrying amount				337,934,000	337,463,000
Wells Fargo Bank \| Secured Debt \| November 2017 Facility
Debt Instrument [Line Items]
Debt instrument due date	Jul. 26, 2024
Wells Fargo Bank \| Revolving Credit Facility \| Secured Debt \| November 2017 Facility
Debt Instrument [Line Items]
Line of credit facility, termination date		Nov. 27, 2017
Line of credit facility, maximum borrowing capacity	$ 65,000,000.0
Total debt outstanding with carrying amount				$ 30,000,000.0	$ 30,000,000.0
Wells Fargo Bank \| Letters of Credit \| Secured Debt \| November 2017 Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity sublimit	$ 45,000,000.0
Minimum \| Wells Fargo Bank \| Revolving Credit Facility \| Secured Debt \| November 2017 Facility \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Line of credit facility, floating interest rate				1.15%
Maximum \| Wells Fargo Bank \| Revolving Credit Facility \| Secured Debt \| November 2017 Facility \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Line of credit facility, floating interest rate				1.65%