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Convertible Senior Notes - 2020 Notes-Convertible Bond Hedge and Warrant Transactions (Detail) - Convertible Senior Notes Due 2020 [Member] - shares	1 Months Ended		12 Months Ended
	Jul. 31, 2020	May 31, 2020	Jan. 30, 2021
Debt Instrument
Shares issued upon conversion	1,116,718	14,927
Convertible note bond hedges
Debt Instrument
Shares issued upon conversion			1,386,580

X

- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI https://asc.fasb.org/extlink&oid=126999549&loc=d3e4332-108586

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI https://asc.fasb.org/extlink&oid=126999549&loc=d3e4304-108586

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- 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

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