Debt instrument conversion original debt base principal amount.

No definition available.

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Period Type:	duration

- Definition

Debt instrument, conversion period beginning month and year.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Debt instrument conversion shares to be issued for each base principal amount.

+ References

No definition available.

+ Details

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- Definition

Debt instrument, convertible, latest trading day immediately preceding maturity date.

+ References

No definition available.

+ Details

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- Definition

Debt instrument, maturity year.

+ References

No definition available.

+ Details

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- Definition

Debt instrument, redemption period beginning month and year

+ References

No definition available.

+ Details

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031898-161870

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Period Type:	instant

- Definition

Earliest date when the debt instrument can be converted into equity, in CCYY-MM-DD format.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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- Definition

Remaining amortization period for discount on the liability component of convertible debt which may be settled in cash upon conversion, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 5
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-URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031898-161870

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- Definition

Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instrument must exceed threshold percentage for specified number of trading days to trigger conversion feature.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion.

+ References

No definition available.

+ Details

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- Definition

Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
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+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Description of the frequency of periodic payments (monthly, quarterly, annual).

+ References

+ Details

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 6
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- Definition

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

+ References

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets.

+ References

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- Definition

Amount of the required periodic payments applied to interest.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Balance Type:	credit
Period Type:	instant

- Definition

Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

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.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityLineItems
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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

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.

+ References

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Weighted average interest rate of long-term debt outstanding calculated over time.

+ References

No definition available.

+ Details

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- Definition

The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585

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- Definition

The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

+ References

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Long-Term Debt, Net - Additional Information (Detail)	1 Months Ended				12 Months Ended
Long-Term Debt, Net - Additional Information (Detail)	Aug. 31, 2020 USD ($)	Apr. 30, 2020 USD ($) TradingDay $ / shares shares	Mar. 31, 2020 USD ($)	Jan. 31, 2019 USD ($)	Jan. 30, 2021 USD ($) $ / shares
Line Of Credit Facility [Line Items]
Repayments of lines of credit					$ 330,000,000
Total interest expense for period					2,500,000
Revolving Credit Facility
Line Of Credit Facility [Line Items]
Outstanding borrowings					$ 0
Proceeds from line of credit			$ 330,000,000.0
Repayments of lines of credit	$ 330,000,000.0
Weighted average interest rate					1.66%
Credit Agreement \| Credit Facilities
Line Of Credit Facility [Line Items]
Line of credit facility, expiration period				5 years
Loans and letters of credit maximum borrowing capacity				$ 400,000,000
Credit Agreement \| Stand-by Letters of Credit
Line Of Credit Facility [Line Items]
Letters of credit outstanding amount					$ 7,900,000
Credit Agreement \| Credit Agreement Loans
Line Of Credit Facility [Line Items]
Outstanding borrowings					$ 0
Convertible Senior Notes Due 2025
Line Of Credit Facility [Line Items]
Aggregate principal amount of debt issued		$ 415,000,000
Debt instrument, stated interest rate		3.75%
Debt instrument, maturity year		2025
Debt instrument, interest terms		The Notes have a stated interest rate of 3.75%, payable semi-annually.
Debt instrument, frequency of periodic payment of interest		payable semi-annually
Debt instrument, redemption period beginning month and year		2023-04
Debt instrument, redemption earliest date		Apr. 17, 2023
Debt instrument, redemption, scheduled trading day immediately preceding maturity date \| TradingDay		40
Debt instrument, redemption percentage of common stock price to conversion price		130.00%
Debt instrument, redemption, effect for trading days \| TradingDay		20
Debt instrument, redemption, consecutive trading day period \| TradingDay		30
Debt instrument, conversion period beginning month and year		2025-01
Debt conversion, original debt, principal amount converted		$ 1,000
Debt instrument, conversion price per share \| $ / shares		$ 8.69			$ 8.69
Debt instrument, effective interest rate		10.00%
Debt instrument, remaining amortization period of discount					4 years 3 months
Convertible Senior Notes Due 2025 \| Common Stock
Line Of Credit Facility [Line Items]
Debt conversion, converted instruments, shares issued \| shares		115.1