Details of Certain Balance Sheet Accounts (Tables)

6 Months Ended

Sep. 30, 2011

Balance Sheet Related Disclosures [Abstract]

Accounts receivable, net [Table Text Block]

Accounts receivable, net:

	September 30,			March 31,
(in thousands)	2011			2011
Accounts receivable	$	125,245		$	125,137
Provisions for returns	(8,176		)	(10,437		)
Provisions for promotions, rebates and other	(13,394		)	(10,460		)
Provisions for doubtful accounts and sales allowances	(649		)	(951		)
Accounts receivable, net	$	103,026		$	103,289

Inventory, net [Table Text Block]

Inventory, net:

	September 30,		March 31,
(in thousands)	2011		2011
Raw materials	$	16,176	$	15,315
Work in process	3,026		2,558
Finished goods	41,515		38,600
Inventory, net	$	60,717	$	56,473

Accrued Liabilities [Table Text Block]

Accrued Liabilities:

	September 30,		March 31,
(in thousands)	2011		2011
Employee compensation and benefits	$	23,396	$	27,478
Warranty obligation accrual	13,379		11,016
Accrued advertising and sales and marketing	2,071		2,873
Accrued other	12,483		18,240
Accrued liabilities	$	51,329	$	59,607

Changes in the warranty obligation accrual [Table Text Block]

Changes during the six months ended September 30, 2011 in the warranty obligation accrual, which is included as a component of Accrued liabilities in the Condensed consolidated balance sheets, are as follows:

	Six Months Ended
(in thousands)	September 30, 2011
Warranty obligation accrual at March 31, 2011	$	11,016
Warranty provision relating to products shipped	9,139
Deductions for warranty claims processed	(6,776		)
Warranty obligation accrual at September 30, 2011	$	13,379