Stock Incentive Plans - Summary of the status and shares subject to restricted stock units and average price per share (Details) - Restricted Stock Units (RSUs)	12 Months Ended
	Jun. 30, 2021 $ / shares shares
Number of Shares
Beginning balance, nonvested (in shares) | shares	350,573
Granted (in shares) | shares	137,488
Vested (in shares) | shares	(130,121)
Canceled (in shares) | shares	(8,354)
Ending balance, nonvested (in shares) | shares	349,586
Weighted-Average Grant Date Fair Value
Beginning balance, nonvested (in USD per share) | $ / shares	$ 160.66
Granted (in USD per share) | $ / shares	218.17
Vested (in USD per share) | $ / shares	161.75
Canceled (in USD per share) | $ / shares	188.20
Ending balance, nonvested (in USD per share) | $ / shares	$ 182.22
Director
Number of Shares
Beginning balance, nonvested (in shares) | shares	8,262
Granted (in shares) | shares	8,122
Vested (in shares) | shares	(8,298)
Canceled (in shares) | shares	(610)
Ending balance, nonvested (in shares) | shares	7,476
Weighted-Average Grant Date Fair Value
Beginning balance, nonvested (in USD per share) | $ / shares	$ 187.49
Granted (in USD per share) | $ / shares	214.46
Vested (in USD per share) | $ / shares	187.49
Canceled (in USD per share) | $ / shares	203.23
Ending balance, nonvested (in USD per share) | $ / shares	$ 215.51