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v3.20.2

Long-Term Debt, Net - Additional Information (Detail) | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Apr. 30, 2020 USD ($) TradingDay $ / shares shares | Jan. 31, 2019 USD ($) | Oct. 31, 2020 USD ($) $ / shares | Oct. 31, 2020 USD ($) $ / shares
Line Of Credit Facility [Line Items] |  |  |  |
Weighted average interest rate |  |  | 0.34% | 1.79%
Total interest expense for period |  |  | $ 100,000 | $ 2,500,000
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 |  |
Line of credit facility, expiration date |  | Jan. 30, 2024 |  |
Credit Agreement | Stand-by Letters of Credit |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Letters of credit outstanding amount |  |  | $ 7,900,000 | $ 7,900,000
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 | $ 8.75 |  | $ 8.75 | $ 8.75
Debt instrument, effective interest rate | 10.00% |  |  |
Debt instrument, remaining amortization period of discount | 4 years 6 months |  |  |
Convertible Senior Notes Due 2025 | Common Stock |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Debt conversion, converted instruments, shares issued | shares | 114.3 |  |  |

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