Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Mar. 31, 2011
Current assets
Cash and cash equivalents	$ 97,587	$ 74,354
Accounts receivable, net of allowance of $632 and $661, respectively	32,531	31,926
Inventories, net of allowance of $1,066 and $1,851, respectively	15,710	10,921
Prepaid expenses	2,975	2,829
Other current assets	5,492	7,747
Assets of discontinued operations - current		102,015
Total current assets	154,295	229,792
Property and equipment, net	16,504	24,855
Goodwill	15,198	15,211
Intangible assets, net of amortization of $21,560 and $20,068, respectively	14,135	22,535
Other non-current assets	4,007	11,709
Assets of discontinued operations - non-current		8,296
Total assets	204,139	312,398
Current liabilities
Accounts payable	24,938	17,852
Deferred revenue	28,441	23,995
Accrued liabilities	23,983	14,936
Capital lease obligations - current	647	999
Liabilities of discontinued operations - current		89,005
Total current liabilities	78,009	146,787
Deferred income taxes - non-current, net	5,135	3,894
Capital lease obligations - non-current	347	907
Other non-current liabilities	6,210	11,972
Liabilities of discontinued operations - non-current		734
Commitments and contingencies (see Note 12)
Shareholders' equity:
Common shares, without par value, at $0.30 stated value; 80,000,000 shares authorized; 31,606,831 shares issued; and 21,875,850 and 23,022,398 shares outstanding at March 31, 2012 and 2011, respectively	9,482	9,482
Treasury shares (9,730,981 and 8,584,433 at March 31, 2012 and 2011, respectively)	(2,919)	(2,575)
Capital in excess of stated value	(16,032)	(5,421)
Retained earnings	123,876	146,659
Accumulated other comprehensive income (loss)	31	(41)
Total shareholders' equity	114,438	148,104
Total liabilities and shareholders' equity	$ 204,139	$ 312,398