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Stockholders' Equity - Stock-based Compensation (Details) $ / shares in Units, $ in Thousands	3 Months Ended			6 Months Ended
	Dec. 31, 2018 USD ($) $ / shares shares	Sep. 30, 2018 $ / shares shares	Dec. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) ShareBasedCompensationPlan $ / shares shares	Dec. 31, 2017 USD ($) shares
Stock-based Compensation
Stock-based compensation expense, before taxes | $	$ 8,163		$ 6,253	$ 13,626	$ 11,740
Less: related income tax benefit | $	(2,038)		(1,935)	(3,380)	(3,627)
Stock-based compensation expense, net of estimated taxes | $	6,125		4,318	10,246	$ 8,113
RSU
Stock-based Compensation
Unrecognized compensation cost | $	$ 24,700			$ 24,700
Weighted-average period				1 year 9 months 18 days
Shares
Nonvested at the beginning of the period (in shares)		526,377		526,377
Granted (in shares)				358,213
Vested (in shares)				(356,705)
Forfeited (in shares)				(12,414)
Nonvested at the end of the period (in shares)	515,471			515,471
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				73.64
Vested (in dollars per share) | $ / shares				71.02
Forfeited (in dollars per share) | $ / shares				73.54
Nonvested at the end of the period (in dollars per share) | $ / shares	$ 73.33			$ 73.33
Stock options
Stock-based Compensation
Unrecognized compensation cost | $	$ 700			$ 700
Weighted-average period				2 years 2 months 12 days
Number of Options
Outstanding at the beginning of the period (in shares)		677,525		677,525
Granted (in shares)				18,135
Exercised (in shares)				(49,395)
Expired or forfeited (in shares)				(6,914)
Outstanding at the end of the period (in shares)	639,351			639,351
Exercisable at the end of the period (in shares)	600,813			600,813
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				18.09
Expired or forfeited (in dollars per share) | $ / shares				69.47
Outstanding at the end of the period (in dollars per share) | $ / shares	$ 34.67			34.67
Exercisable at the end of the period (in dollars per share) | $ / shares	$ 31.92			$ 31.92
Weighted-Average Remaining Contractual Term
Outstanding at the end of the period		2 years 8 months 12 days
Exercisable at the end of the period		2 years 3 months 18 days
Aggregate Intrinsic Value
Outstanding at the end of the period | $	$ 25,026			$ 25,026
Exercisable at the end of the period | $	$ 25,001			$ 25,001
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, before taxes | $	$ 150		247	$ 356	$ 487
Selling, general and administrative
Stock-based Compensation
Stock-based compensation expense, before taxes | $	7,833		5,849	12,945	10,960
Research and development
Stock-based Compensation
Stock-based compensation expense, before taxes | $	$ 180		$ 157	$ 325	$ 293

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