FINANCIAL INFORMATION Revised Consolidated Balance Sheets (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 48,203	$ 64,506	$ 70,390
Accounts receivable		56,625	67,956
Inventories		66,643	69,143
Deferred tax assets, net		560	586
Prepaid expenses		10,681	9,060
Other current assets		18,729	19,950
Total current assets		217,744	237,085
Property and equipment, net		38,719	41,441
Intangible assets, net		7,765	9,217
Other assets		2,943	3,793
Total assets		269,872	294,361
Current liabilities:
Accounts payable		29,968	35,425
Accrued compensation and benefits		22,485	25,177
Accrued expenses and other current liabilities		30,389	34,003
Income taxes payable		6,931	7,969
Deferred revenues		231,362	230,305
Total current liabilities		321,335	333,082
Long-term liabilities		16,138	17,978
Total liabilities		647,737	679,953
Stockholders' equity:
Common stock		423	423
Additional paid-in capital		1,040,128	1,039,562
Accumulated deficit		(1,349,414)	(1,357,679)
Treasury stock at cost, net of reissuances		(74,036)	(75,542)
Accumulated other comprehensive income		5,034	7,644
Total stockholders' equity		(377,865)	(385,592)
Total liabilities and stockholders' equity		$ 269,872	$ 294,361