CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
Net sales	$ 46,977	$ 82,986
Cost of sales	38,144	52,084
Gross profit	8,833	30,902
Operating expenses:
Selling, general and administrative	21,044	21,814
Research and development	7,611	8,694
Advertising	3,041	1,904
Depreciation and amortization	2,842	2,615
Total operating expenses	34,538	35,027
Loss from operations	(25,705)	(4,125)
Other income (expense):
Interest income	35	18
Other, net	(354)	(305)
Total other (expense), net	(319)	(287)
Loss before income taxes	(26,024)	(4,412)
Benefit from income taxes	(9,656)	(1,122)
Net loss	$ (16,368)	$ (3,290)
Net loss per share:
Class A and B - basic and diluted	$ (0.23)	$ (0.05)
Weighted-average shares used to calculate net loss per share:
Class A and B - basic and diluted	69,754	68,199