Significant Components of Net Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands	Sep. 30, 2011	Sep. 30, 2010
Income Taxes [Line Items]
Accruals and reserves not currently deductible	$ 10,357	$ 9,739
Federal, state and foreign tax credits	22,673	18,178
Depreciation	527	7,946
Amortization		4,406
Other assets	3,304	7,463
Net operating loss carryforwards	119,167	139,464
Inventory reserves and valuation	11,650	12,284
Deferred tax assets	167,678	199,480
Intangible amortization	7,378
Other liabilities		540
Deferred tax liabilities	7,378	540
Valuation allowance	162,208	198,940
Net deferred tax liabilities	$ (1,908)