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Borrowing Arrangements - Additional Information (Details) | 1 Months Ended | 3 Months Ended
--- | --- | ---
Jan. 31, 2020 USD ($) | Dec. 31, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2015 USD ($) | Dec. 31, 2012 USD ($) | Apr. 30, 2021 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum borrowing capacity |  | $ 650,000,000.0 |  |  |  |
Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt redemption percentage of principle amount (as a percent) |  |  |  |  |  | 101.00%
Senior Notes | 2020 Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate principal amount | $ 500,000,000.0 |  |  |  |  | $ 500,000,000.0
Stated interest rate | 2.85% |  |  |  |  |
Unamortized discount | $ 1,100,000 |  |  |  |  |
Debt issuance costs | 4,800,000 |  |  |  |  |
Proceeds from debt, net of issuance costs | 494,100,000 |  |  |  |  |
Senior Notes | 2015 Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Repayments of debt | $ 450,000,000.0 |  |  |  |  |
Senior Notes | 2017 Notes due in 2027 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate principal amount |  |  | $ 500,000,000.0 |  |  |
Stated interest rate |  |  | 3.50% |  |  |
Unamortized discount |  |  | $ 3,100,000 |  |  |
Debt issuance costs |  |  | 4,900,000 |  |  |
Proceeds from debt, net of issuance costs |  |  | 492,000,000.0 |  |  |
Senior Notes | 2017 Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  | 500,000,000.0
Repayments of debt |  |  | $ 400,000,000.0 |  |  |
Senior Notes | 2015 Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate principal amount |  |  |  | $ 300,000,000.0 |  | 300,000,000.0
Stated interest rate |  |  |  | 4.375% |  |
Unamortized discount |  |  |  | $ 1,100,000 |  |
Debt issuance costs |  |  |  | 2,500,000 |  |
Proceeds from debt, net of issuance costs |  |  |  | $ 296,400,000 |  |
Senior Notes | 2012 Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate principal amount |  |  |  |  | $ 350,000,000.0 | $ 350,000,000.0
Stated interest rate |  |  |  |  | 3.60% |
Unamortized discount |  |  |  |  | $ 500,000 |
Debt issuance costs |  |  |  |  | 2,800,000 |
Proceeds from debt, net of issuance costs |  |  |  |  | $ 346,700,000 |
Revolving Credit Facility | December 17, 2018 Credit Agreement |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of credit facility, increase limit |  | $ 350,000,000.0 |  |  |  |
Fiscal Quarter Ending April 30, 2019 | Revolving Credit Facility | December 17, 2018 Credit Agreement |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt covenant, interest coverage ratio, minimum |  | 3.00 |  |  |  |
Fiscal Quarter Ending January 31, 2020 | Revolving Credit Facility | December 17, 2018 Credit Agreement |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt covenant, leverage ratio, maximum |  | 3.00 |  |  |  |
Minimum | Base Rate | Revolving Credit Facility | December 17, 2018 Credit Agreement |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 0.00%
Minimum | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | December 17, 2018 Credit Agreement |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 0.90%
Maximum | Base Rate | Revolving Credit Facility | December 17, 2018 Credit Agreement |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 0.50%
Maximum | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | December 17, 2018 Credit Agreement |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 1.50%

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