Reclassification of Prior Periods (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended				3 Months Ended		6 Months Ended	3 Months Ended		6 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011		Jun. 30, 2012 As Reported [Member]	Sep. 30, 2011 As Reported [Member]	Sep. 30, 2011 As Reported [Member]	Jun. 30, 2012 As Adjusted [Member]	Sep. 30, 2011 As Adjusted [Member]	Sep. 30, 2011 As Adjusted [Member]
Cost of sales	$ 189,103	[1]	$ 143,899	[1]	$ 336,440	[1]	$ 296,949	[1]	$ 149,055	$ 145,608	$ 300,367	$ 147,337	$ 143,899	$ 296,949
Gross Profit	$ 194,195		$ 196,703		$ 398,992		$ 418,160		$ 203,079	$ 194,994	$ 414,742	$ 204,797	$ 196,703	$ 418,160
Gross margin									57.70%	57.20%	58.00%	58.20%	57.80%	58.50%

[1] Includes share-based compensation expense as follows:Cost of sales 2,614 1,608 3,924 3,007 Research and development 6,358 3,556 10,390 6,969Selling, general and administrative 11,581 4,320 16,225 8,532