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Subsequent Events (Details) - USD ($) $ in Thousands, shares in Millions	1 Months Ended	2 Months Ended		3 Months Ended	12 Months Ended
	Jan. 31, 2021	Mar. 31, 2021	Mar. 25, 2021	Jul. 31, 2021	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2019
Subsequent Event [Line Items]
Repayments of convertible debt					$ 384,199	$ 0	$ 0
Stock issued as repayment of convertible debt, value							$ 524,979
Convertible Debt | Convertible Senior Notes Due 2023
Subsequent Event [Line Items]
Debt conversion, converted instrument, amount	$ 23,900				1,700,000
Repayments of convertible debt					460,000
Cash payments to extinguish debt					$ 459,200
Stock issued as repayment of convertible debt (in shares)					4.7
Stock issued as repayment of convertible debt, value					$ 1,200,000
Subsequent Event | Convertible Debt | Convertible Senior Notes Due 2023
Subsequent Event [Line Items]
Debt conversion, converted instrument, amount		$ 12,800	$ 72,300	$ 6,600
Repayments of convertible debt			23,900
Cash payments to extinguish debt			$ 23,900
Stock issued as repayment of convertible debt (in shares)			0.2
Stock issued as repayment of convertible debt, value			$ 48,400

X

- Definition

The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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Amount of cash outflow for cost from early extinguishment and prepayment of debt. Includes, but is not limited to, third-party cost, premium paid, and other fee paid to lender directly for debt extinguishment or debt prepayment. Excludes accrued interest.

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The cash outflow from the repayment of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

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Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering.

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Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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