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Stockholders' Equity - Stock-based Compensation (Details) $ / shares in Units, $ in Thousands	3 Months Ended			9 Months Ended
	Mar. 31, 2019 USD ($) $ / shares shares	Sep. 30, 2018 $ / shares shares	Mar. 31, 2018 USD ($)	Mar. 31, 2019 USD ($) ShareBasedCompensationPlan $ / shares shares	Mar. 31, 2018 USD ($) shares
Stock-based Compensation
Stock-based compensation expense | $	$ 5,888		$ 6,014	$ 19,514	$ 17,754
RSU
Stock-based Compensation
Unrecognized compensation cost | $	$ 19,400			$ 19,400
Weighted-average period				1 year 10 months 24 days
Shares
Nonvested at the beginning of the period (in shares)		526,377		526,377
Granted (in shares)				362,025
Vested (in shares)				(357,924)
Forfeited (in shares)				(13,669)
Nonvested at the end of the period (in shares)	516,809			516,809
Weighted-Average Fair Value
Nonvested at the beginning of the period (in dollars per share) | $ / shares		$ 71.56		$ 71.56
Granted (in dollars per share) | $ / shares				73.80
Vested (in dollars per share) | $ / shares				71.01
Forfeited (in dollars per share) | $ / shares				73.74
Nonvested at the end of the period (in dollars per share) | $ / shares	$ 73.45			$ 73.45
Stock options
Stock-based Compensation
Unrecognized compensation cost | $	$ 600			$ 600
Weighted-average period				2 years
Number of Options
Outstanding at the beginning of the period (in shares)		677,525		677,525
Granted (in shares)				18,135
Exercised (in shares)				(108,008)
Expired or forfeited (in shares)				(9,618)
Outstanding at the end of the period (in shares)	578,034			578,034
Exercisable at the end of the period (in shares)	540,646			540,646
Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share) | $ / shares		$ 32.80		$ 32.80
Granted (in dollars per share) | $ / shares				72.39
Exercised (in dollars per share) | $ / shares				22.82
Expired or forfeited (in dollars per share) | $ / shares				70.28
Outstanding at the end of the period (in dollars per share) | $ / shares	$ 35.29			35.29
Exercisable at the end of the period (in dollars per share) | $ / shares	$ 32.37			$ 32.37
Weighted-Average Remaining Contractual Term
Outstanding at the end of the period		2 years 7 months 6 days
Exercisable at the end of the period		2 years 1 month 6 days
Aggregate Intrinsic Value
Outstanding at the end of the period | $	$ 30,247			$ 30,247
Exercisable at the end of the period | $	$ 29,865			$ 29,865
Performance-based restricted stock units
Shares
Granted (in shares)				97,514	117,346
Performance-based restricted stock units | Minimum
Weighted-Average Fair Value
Payout as a percentage of the original number of shares awarded or units awarded, which are converted into shares of the Company's common stock				0.00%
Performance-based restricted stock units | Maximum
Weighted-Average Fair Value
Payout as a percentage of the original number of shares awarded or units awarded, which are converted into shares of the Company's common stock				280.00%
2012 Plan
Weighted-Average Fair Value
Shares available for grant	1,600,000			1,600,000
2012 Plan | RSU
Weighted-Average Fair Value
Number of shares available for grant reduced for each award granted				1.87
Number of shares available for grant increased for each award forfeited and returned				1.87
2005 AS&E Plan and the 2014 AS&E Plan
Stock-based Compensation
Number of share-based employee compensation plans assumed | ShareBasedCompensationPlan				2
2005 AS&E Plan and the 2014 AS&E Plan | RSU
Shares
Granted (in shares)				0
2006 Plan
Number of Options
Granted (in shares)				0
Cost of goods sold
Stock-based Compensation
Stock-based compensation expense | $	$ 182		251	$ 539	$ 739
Selling, general and administrative
Stock-based Compensation
Stock-based compensation expense | $	5,543		5,614	18,487	16,574
Research and development
Stock-based Compensation
Stock-based compensation expense | $	$ 163		$ 149	$ 488	$ 441

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