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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Aggregate number of common shares reserved for future issuance.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement.

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Amount of cash inflow from exercise of option under share-based payment arrangement.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of shares authorized for issuance under share-based payment arrangement.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Purchase price of common stock expressed as a percentage of its fair value.

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Number of shares of capital stock issued (purchased by employees) in connection with an employee stock ownership plan.

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Aggregate change in value for stock issued during the period as a result of employee stock purchase plan.

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Stock-Based Compensation - Additional Disclosures (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018	Jul. 26, 2018	Apr. 30, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of shares of common stock		$ 9,004,000	$ 10,864,000	$ 13,466,000
Payments related to tax withholding		$ 10,167,000	$ 14,477,000	$ 7,896,000
Common stock reserved for future issuance or settlement (in shares)		6,000,000.0
Share-based Payment Arrangement, Expense		$ 31,548,000
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in dollars per share)		$ 133.35	$ 114.72	$ 64.32
Total fair value of shares vested from RSU grants		$ 29,700,000	$ 39,900,000	$ 23,000,000.0
Total unrecognized compensation cost		$ 20,100,000
Total unrecognized compensation cost, period of recognition		2 years 1 month 2 days
Granted (in shares)		266,514
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period		444,175
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost		$ 10,000,000.0
Total unrecognized compensation cost, period of recognition		2 years 5 months 1 day
Granted (in dollars per share)		$ 133.00	$ 113.88	$ 64.30
Total intrinsic value of options exercised		$ 9,900,000	$ 18,200,000	$ 15,100,000
Issuance of shares of common stock		9,000,000.0	10,900,000	13,500,000
Payments related to tax withholding		$ 10,200,000	14,700,000	$ 8,100,000
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance Shares, Performance Target		10.00%
Granted (in shares)		418,886
Share-based Payment Arrangement, Expense		$ 0
2010 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares authorized (in shares)						7,000,000
2018 Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuance or settlement (in shares)		217,739
Maximum number of shares authorized (in shares)					250,000
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent	85.00%
Stock Issued During Period, Shares, Employee Stock Ownership Plan	13,039	19,222
Stock Issued During Period, Value, Employee Stock Purchase Plan	$ 900,000	$ 1,800,000
Share-based Payment Arrangement, Expense		$ 500,000	$ 300,000