Note 18. Income Taxes (Detail) - Significant Components of Net Deferred Taxes (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Apr. 01, 2012
Deferred tax assets:
Reserves and expenses not currently deductible	$ 8,049	$ 9,369
Net operating loss carryforwards	124,662	124,952
Tax credits	29,109	29,567
Losses on investments	2,110	2,261
Intangible assets	6,225	8,215
Deferred margin	4,158	4,723
Depreciation	604	4,058
Total deferred tax assets	174,917	183,145
Deferred tax liabilities:
Unrealized investment gain	(116)	(247)
Non-goodwill intangibles	(930)	(2,349)
Total deferred tax liabilities	(1,046)	(2,596)
Valuation allowance	(173,927)	(180,579)
Net deferred tax liabilities	$ (56)	$ (30)