Reclassification of Prior Periods (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended				3 Months Ended		9 Months Ended	3 Months Ended		9 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2012		Dec. 31, 2011		Jun. 30, 2012 As Reported [Member]	Dec. 31, 2011 As Reported [Member]	Dec. 31, 2011 As Reported [Member]	Jun. 30, 2012 As Adjusted [Member]	Dec. 31, 2011 As Adjusted [Member]	Dec. 31, 2011 As Adjusted [Member]
Cost of sales	$ 215,619	[1]	$ 143,668	[1]	$ 552,059	[1]	$ 440,617	[1]	$ 149,055	$ 145,377	$ 445,744	$ 147,337	$ 143,668	$ 440,617
Gross Profit	$ 200,428		$ 185,488		$ 599,420		$ 603,648		$ 203,079	$ 183,779	$ 598,521	$ 204,797	$ 185,488	$ 603,648
Gross margin									57.70%	55.80%	57.30%	58.20%	56.40%	57.80%

[1] Includes share-based compensation expense as follows:Cost of sales 1,834 1,369 5,758 4,376 Research and development 6,172 3,851 16,562 10,820Selling, general and administrative 6,114 4,742 22,339 13,274