Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Mar. 31, 2012
Current assets:
Cash and cash equivalents	$ 77,327	$ 97,587
Accounts receivable, net of allowances of $638 and $632, respectively	33,710	32,531
Inventories	12,164	15,710
Prepaid expenses	2,937	2,975
Other current assets	1,856	5,492
Total current assets	127,994	154,295
Property and equipment, net	15,396	16,504
Goodwill	15,223	15,198
Intangible assets, net	14,951	14,135
Other non-current assets	4,132	4,007
Total assets	177,696	204,139
Current liabilities:
Accounts payable	21,048	24,938
Deferred revenue	20,128	28,441
Accrued liabilities	11,515	23,983
Capital lease obligations, current	429	647
Total current liabilities	53,120	78,009
Deferred income taxes, non-current	5,170	5,135
Capital lease obligations, non-current	501	347
Other non-current liabilities	5,802	6,210
Commitments and contingencies (see Note 7)
Shareholders' equity:
Common shares, without par value, at $0.30 stated value; 80,000,000 shares authorized; 31,606,831 shares issued; and 22,104,245 and 21,875,850 shares outstanding and June 30, 2012 and March 31, 2012, respectively	9,482	9,482
Treasury shares, 9,502,586 and 9,730,981 at June 30, 2012 and March 31, 2012, respectively	(2,839)	(2,919)
Capital in excess of stated value	(15,348)	(16,032)
Retained earnings	121,732	123,876
Accumulated other comprehensive income	76	31
Total shareholders' equity	113,103	114,438
Total liabilities and shareholders' equity	$ 177,696	$ 204,139