Stock Incentive Plans - Summary of the status and shares subject to restricted stock units and average price per share (Details) - Restricted Stock Units (RSUs) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock unit, vesting period (in years)	3 years
Number of Shares
Beginning balance, nonvested (in shares)	374,168
Granted (in shares)	249,892
Vested (in shares)	(194,844)
Canceled (in shares)	(34,887)
Ending balance, nonvested (in shares)	394,329	374,168
Weighted-Average Grant Date Fair Value
Beginning balance, nonvested (in USD per share)	$ 111.82
Granted (in USD per share)	128.30
Vested (in USD per share)	110.74
Canceled (in USD per share)	133.12
Ending balance, nonvested (in USD per share)	$ 120.92	$ 111.82
RSUs - Additional Disclosures
Stock-based compensation expense	$ 23,025	$ 21,190	$ 22,547
Expense for nonvested restricted stock units has yet to be recognized	$ 19,915
Expense for nonvested restricted stock units has yet to be recognized, amortized over a weighted-average period (in months)	24 months
Total fair value of shares vested	$ 21,576	21,173	18,953
Tax benefit relating to issuance of common stock for restricted stock units	$ 939	$ 870	$ 704
Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock unit, vesting period (in years)	1 year
Number of Shares
Granted (in shares)	12,430,000	14,404,000
RSUs - Additional Disclosures
Stock-based compensation expense	$ 1,560	$ 824
Expense for nonvested restricted stock units has yet to be recognized	$ 505
Expense for nonvested restricted stock units has yet to be recognized, amortized over a weighted-average period (in months)	4 months
Tax benefit relating to issuance of common stock for restricted stock units	$ 105