CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Income Statement [Abstract]
Net sales	$ 795,902	$ 784,678	$ 1,496,562	$ 1,476,420
Cost of sales	404,885	369,539	804,836	750,636
Gross profit	391,017	415,139	691,726	725,784
Selling, general and administrative expenses	188,517	200,558	501,721	502,102
Income from operations	202,500	214,581	190,005	223,682
Other expense (income), net:
Interest income	(49)	(38)	(230)	(122)
Interest expense	2,075	1,308	4,642	3,746
Other, net	(184)	(5)	(225)	(130)
Total other expense, net	1,842	1,265	4,187	3,494
Income before income taxes	200,658	213,316	185,818	220,188
Income tax expense	43,737	56,610	39,847	59,814
Net income	156,921	156,706	145,971	160,374
Other comprehensive income (loss), net of tax:
Unrealized gain (loss) on foreign currency hedging	1,417	(682)	981	759
Foreign currency translation adjustment	(3,568)	(6,647)	(1,893)	(11,147)
Total other comprehensive loss, net	(2,151)	(7,329)	(912)	(10,388)
Comprehensive income	$ 154,770	$ 149,377	$ 145,059	$ 149,986
Net income per share:
Basic (in USD per share)	$ 4.85	$ 4.54	$ 4.47	$ 4.64
Diluted (in USD per share)	$ 4.78	$ 4.50	$ 4.40	$ 4.59
Weighted-average common shares outstanding:
Basic (in shares)	32,341	34,537	32,655	34,598
Diluted (in shares)	32,843	34,853	33,157	34,912