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v3.21.1

Debt - Narrative (Details) $ / shares in Units, shares in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2021 USD ($) $ / shares | Sep. 30, 2018 USD ($) day $ / shares | Jan. 31, 2021 USD ($) $ / shares shares | Jan. 31, 2020 USD ($) | Jan. 31, 2019 USD ($)
Debt Conversion [Line Items] |  |  |  |  |
Proceeds from issuance of debt |  |  | $ 677,370,000 | $ 0 | $ 560,756,000
Repayments of convertible debt |  |  | 384,199,000 | 0 | 0
Stock issued as repayment of convertible debt, value |  |  |  |  | 524,979,000
Fair value of shares issued as part of the repayments of convertible senior notes |  |  | 1,233,990,000 | 0 | 0
Loss on extinguishment of debt |  |  | (33,752,000) | 0 | $ 0
Convertible debt reclassified to convertible senior notes, current | $ 20,469,000 |  | $ 20,469,000 | 0 |
Minimum |  |  |  |  |
Debt Conversion [Line Items] |  |  |  |  |
Commitment fee percentage |  |  | 0.25% |  |
Maximum |  |  |  |  |
Debt Conversion [Line Items] |  |  |  |  |
Commitment fee percentage |  |  | 0.30% |  |
Convertible Debt | Convertible Senior Notes Due 2023 |  |  |  |  |
Debt Conversion [Line Items] |  |  |  |  |
Repayments of convertible debt |  |  | $ 460,000,000.0 |  |
Debt conversion, converted instrument, amount | 23,900,000 |  | 1,700,000,000 |  |
Cash payments to extinguish debt |  |  | $ 459,200,000 |  |
Stock issued as repayment of convertible debt (in shares) | shares |  |  | 4.7 |  |
Stock issued as repayment of convertible debt, value |  |  | $ 1,200,000,000 |  |
Loss on extinguishment of debt |  |  | (33,800,000) |  |
Convertible Debt | Reclassification from Noncurrent to Current | Convertible Senior Notes Due 2023 |  |  |  |  |
Debt Conversion [Line Items] |  |  |  |  |
Convertible debt reclassified to convertible senior notes, current | 20,500,000 |  | 20,500,000 |  |
Convertible Debt | Reclassification from Permanent Equity to Mezzanine Equity | Convertible Senior Notes Due 2023 |  |  |  |  |
Debt Conversion [Line Items] |  |  |  |  |
Convertible debt reclassified to mezzanine equity from permanent equity | 3,400,000 |  | 3,400,000 |  |
Line of Credit | Revolving Credit Facility |  |  |  |  |
Debt Conversion [Line Items] |  |  |  |  |
Maximum borrowing capacity | 500,000,000.0 |  | 500,000,000.0 |  |
Accordion feature, increase limit | 250,000,000.0 |  | 250,000,000.0 |  |
Convertible Senior Notes Due 2023 | Convertible Debt |  |  |  |  |
Debt Conversion [Line Items] |  |  |  |  |
Aggregate principal amount of debt issued | 575,000,000 | $ 575,000,000.0 | 575,000,000 | 575,000,000 |
Debt interest rate percentage |  | 0.50% |  |  |
Additional principal amount purchased |  | $ 75,000,000.0 |  |  |
Proceeds from issuance of debt |  | $ 560,800,000 |  |  |
Conversion price (in usd per share) | $ / shares |  | $ 71.50 |  |  |
Percentage of principal amount redeemable |  | 100.00% |  |  |
Trading days | day |  | 20 |  |  |
Consecutive trading days | day |  | 30 |  |  |
Percentage of conversion price |  | 130.00% |  |  |
Convertible debt reclassified to mezzanine equity from permanent equity | $ 99,398,000 |  | $ 99,398,000 | $ 131,331,000 |
Convertible Senior Notes Due 2024 | Convertible Debt |  |  |  |  |
Debt Conversion [Line Items] |  |  |  |  |
Debt interest rate percentage | 0.00% |  | 0.00% |  |
Additional principal amount purchased | $ 90,000,000.0 |  | $ 90,000,000.0 |  |
Proceeds from issuance of debt | $ 677,300,000 |  |  |  |
Conversion price (in usd per share) | $ / shares | $ 420.24 |  | $ 420.24 |  |
Convertible debt reclassified to mezzanine equity from permanent equity | $ 63,268,000 |  | $ 63,268,000 |  |
Capped Calls | Convertible Senior Notes Due 2023 |  |  |  |  |
Debt Conversion [Line Items] |  |  |  |  |
Initial cap price (in usd per share) | $ / shares | $ 110.00 |  | $ 110.00 |  |
Capped Calls | Convertible Senior Notes Due 2024 |  |  |  |  |
Debt Conversion [Line Items] |  |  |  |  |
Initial cap price (in usd per share) | $ / shares | $ 525.30 |  | $ 525.30 |  |
Conversion Covenant One | Convertible Senior Notes Due 2023 | Convertible Debt |  |  |  |  |
Debt Conversion [Line Items] |  |  |  |  |
Trading days | day |  | 20 |  |  |
Consecutive trading days | day |  | 30 |  |  |
Percentage of conversion price |  | 130.00% |  |  |
Conversion Covenant Two | Convertible Senior Notes Due 2023 | Convertible Debt |  |  |  |  |
Debt Conversion [Line Items] |  |  |  |  |
Trading days | day |  | 5 |  |  |
Consecutive trading days | day |  | 10 |  |  |
Percentage of conversion price |  | 98.00% |  |  |

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