Share-Based Compensation (Stock Option Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
	May 09, 2016	Jun. 30, 2016	Jun. 30, 2015
Shares
Outstanding, beginning of period (in shares)		727,700	871,200
Granted (in shares)	224,843	224,800	186,300
Exercised (in shares)		(105,700)	(330,400)
Forfeited or expired (in shares)		(45,500)	(900)
Outstanding, end of period (in shares)		801,300	726,200
Exercisable, end of period (in shares)		386,400	322,500
Weighted- Average Exercise Price
Outstanding, beginning of period, weighted-average exercise price (in USD per share)		$ 30.70	$ 23.40
Granted, weighted-average exercise price (in USD per share)		57.18	41.44
Exercised, weighted-average exercise price (in USD per share)		32.20	19.15
Forfeited or expired, weighted-average exercise price (in USD per share)		37.34	33.50
Outstanding, end of period, weighted-average exercise price (in USD per share)		37.55	29.95
Exercisable, end of period, weighted-average exercise price (in USD per share)		$ 25.20	$ 21.54
Options, Additional Disclosures:
Outstanding, end of period, weighted-average remaining contractual term		8 years	8 years 3 months
Exercisable, end of period, weighted-average remaining contractual term		6 years 8 months 12 days	7 years 2 months
Outstanding, end of period, aggregate intrinsic value		$ 14,700	$ 11,830
Exercisable, end of period, aggregate intrinsic value		$ 11,669	$ 7,966