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Stock Compensation - Narrative (Details) - Stock Incentive Plan 2015 - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended
	Jul. 31, 2019	Jun. 30, 2019	Jun. 30, 2018
LTIP PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		0
LTIP NQSOs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares)		0
2007 LTIP SARs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		0
Annual RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		11,334	16,359
Award vesting period (in years)		3 years
Weighted-average grant date fair value (in dollars per share)		$ 173.77	$ 118.88
Annual PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		10,764	14,112
Award vesting period (in years)		3 years
Weighted-average grant date fair value (in dollars per share)		$ 173.69	$ 118.67
Annual RSUs and Annual PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		22,098	30,471
Unrecognized stock compensation expense		$ 10,452
Weighted-average grant date fair value (in dollars per share)		$ 173.73	$ 118.78
Subsequent Event \| Annual RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	25,266
Weighted-average grant date fair value (in dollars per share)	$ 175.14
Subsequent Event \| Annual PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	9,174
Weighted-average grant date fair value (in dollars per share)	$ 175.14