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Stock-Based Compensation - Additional Disclosures (Details) - USD ($)	3 Months Ended		9 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Stock-based compensation, additional disclosures
Issuance of shares of common stock			$ 12,508,000	$ 5,364,000
Common stock reserved for future issuance or settlement (in shares)	5,500,000		5,500,000
Employee stock purchase plan, stock-based compensation	$ 9,225,000	$ 7,299,000	$ 24,589,000	$ 24,133,000
Restricted Stock Units
Stock-based compensation, additional disclosures
Weighted average grant-date fair value of RSUs granted			$ 130.63
Performance awards, shares granted			245,023
Performance awards, shares forfeited			33,060
Stock Options
Stock-based compensation, additional disclosures
Weighted average fair value (in dollars per share)	$ 45.63	$ 37.54	$ 38.76	$ 33.15
Performance Shares [Member]
Stock-based compensation, additional disclosures
Employee stock purchase plan, stock-based compensation				$ 0
2018 Employee Stock Purchase Plan
Stock-based compensation, additional disclosures
Common stock reserved for future issuance or settlement (in shares)	208,687		208,687
Employee stock purchase plan, purchase price of common stock, percent	85.00%
Employee stock purchase plan, stock-based compensation	$ 200,000	$ 200,000	$ 500,000	$ 400,000
Employee stock purchase plan, number of shares authorized	250,000		250,000