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Long-Term Debt (Details) - USD ($)	3 Months Ended
	Oct. 31, 2021	Jul. 31, 2021	Jul. 21, 2020	Dec. 03, 2014
Line of Credit Facility [Line Items]
Applicable interest rate added to reference rate in order to compute variable interest rate	1.50%
Note Purchase Agreement | Senior Notes
Line of Credit Facility [Line Items]
Debt instrument face amount				$ 400,000,000
Note Purchase Agreement | Senior Notes, Series A
Line of Credit Facility [Line Items]
Interest rate				4.07%
Note Purchase Agreement | Senior Notes, Series B
Line of Credit Facility [Line Items]
Interest rate				4.19%
Note Purchase Agreement | Senior Notes, Series C
Line of Credit Facility [Line Items]
Interest rate				4.25%
Note Purchase Agreement | Senior Notes, Series D
Line of Credit Facility [Line Items]
Interest rate				4.35%
Senior Notes, Series A | Senior Notes
Line of Credit Facility [Line Items]
Debt instrument face amount				$ 100,000,000
Senior Notes, Series B | Senior Notes
Line of Credit Facility [Line Items]
Debt instrument face amount				100,000,000
Senior Notes, Series C | Senior Notes
Line of Credit Facility [Line Items]
Debt instrument face amount				100,000,000
Senior Notes, Series D | Senior Notes
Line of Credit Facility [Line Items]
Debt instrument face amount				$ 100,000,000
Eurodollar
Line of Credit Facility [Line Items]
Applicable interest rate added to reference rate in order to compute variable interest rate	0.75%
WellsFargo,NationalAssociation,TruistBank,BMOHarrisBankN.A.,SantanderBankN.A.,andBankofAmerica,N.A. | Revolving Credit Facility | Line of Credit
Line of Credit Facility [Line Items]
Outstanding borrowings	$ 0	$ 0
WellsFargo,NationalAssociation,TruistBank,BMOHarrisBankN.A.,SantanderBankN.A.,andBankofAmerica,N.A. | First Amended and Restated Credit Agreement | Revolving Credit Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity			$ 1,050,000,000

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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