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Credit Facility - Narrative (Details) | Sep. 01, 2017 USD ($) | Jul. 31, 2020 | Jan. 31, 2018 | Aug. 31, 2017 USD ($)
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Minimum | Revolving Credit Facility |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Commitment fee percentage on unused portion of the Facility | 0.20% |  |  |
Maximum | Revolving Credit Facility |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Commitment fee percentage on unused portion of the Facility | 0.35% |  |  |
Prior Credit Facility | Revolving Credit Facility | Line of Credit |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Line of credit facility, borrowing capacity |  |  |  | $ 800,000,000.0
Credit Facility |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt Instrument, term | 5 years |  |  |
Weighted average interest rate |  |  | 3.74% |
Deferred financing costs | $ 18,700,000 |  |  |
Credit Facility | Line of Credit |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Deferred financing costs | 5,200,000 |  |  |
Credit Facility | Term Loan |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt instrument, face amount | 800,000,000.0 |  |  |
Deferred financing costs | 13,400,000 |  |  |
Credit Facility | Revolving Credit Facility | Line of Credit |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Line of credit facility, borrowing capacity | 900,000,000.0 |  |  |
Borrowing capacity after initial year of term | 800,000,000.0 |  |  |
Credit Facility | Standby Letters of Credit |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Line of credit facility, borrowing capacity | 300,000,000.0 |  |  |
Credit Facility | Swing Line Loan |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Line of credit facility, borrowing capacity | $ 75,000,000.0 |  |  |
Credit Facility | Minimum |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Fixed charge coverage ratio | 1.50 |  |  |
Credit Facility | Maximum |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Leverage ratio | 4.75 |  |  |
Leverage ratio election option for four fiscal quarters in event of material acquisition | 3.75 |  |  |
Credit Facility | Maximum | Forecast |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Leverage ratio |  | 3.50 |  |
Credit Facility | Eurodollar | Minimum |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Basis spread on variable rate | 1.00% |  |  |
Credit Facility | Eurodollar | Maximum |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Basis spread on variable rate | 2.25% |  |  |
Credit Facility | Base Rate | Minimum |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Basis spread on variable rate | 0.00% |  |  |
Credit Facility | Base Rate | Maximum |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Basis spread on variable rate | 1.25% |  |  |

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