Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Operating Activities:
Net income	$ 6,665us-gaap_NetIncomeLoss	$ 6,089us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities from continuing operations:
Depreciation and amortization	1,389	1,380
Stock-based compensation	1,211us-gaap_ShareBasedCompensation	2,462us-gaap_ShareBasedCompensation
Deferred taxes	795us-gaap_DeferredIncomeTaxExpenseBenefit	(164)us-gaap_DeferredIncomeTaxExpenseBenefit
Gain on sales of available-for-sale securities and strategic investments	(515)us-gaap_GainLossOnSaleOfInvestments	(806)us-gaap_GainLossOnSaleOfInvestments
Excess tax benefit from stock-based compensation plans	(442)	(658)
Other	(40)us-gaap_OtherNoncashIncomeExpense
Change in operating assets and liabilities, excluding the impact from discontinued operations:
Accounts receivable	(176)	(278)
Inventories	(378)us-gaap_IncreaseDecreaseInInventories	570us-gaap_IncreaseDecreaseInInventories
Prepaids and other	(245)	(330)
Accounts payable and accrued liabilities	(609)	(1,770)
Income taxes	(825)	(559)
Net cash provided by operating activities from continuing operations	6,830	5,936
Investing Activities:
Purchases of property and equipment	(163)	(798)
Cash proceeds from sales of property and equipment	42
Purchases of available-for-sale securities	(3,385)	(92,700)
Sales and maturities of available-for-sale securities	3,176	92,514
Cash received from sales of strategic investments		681
Cash transferred to discontinued operations	(45)	(13)
Net cash used in investing activities from continuing operations	(375)	(316)
Financing Activities:
Excess tax benefit from stock-based compensation plans	442	658
Issuance of common stock	348	329
Repurchase of common stock	(20,000)	(12,544)
Purchase of common stock to pay employee taxes	(741)	(1,114)
Net cash used in financing activities from continuing operations	(19,951)	(12,671)
Net cash used in continuing operations	(13,496)	(7,051)
Discontinued Operations:
Net cash used in operating activities	(45)	(13)
Net cash provided by financing activities	45	13
Net cash provided by discontinued operations	0	0
Net change in cash and cash equivalents	(13,496)	(7,051)
Cash and Cash Equivalents:
Beginning of period	43,511	15,495
End of period	30,015	8,444
Supplemental Information:
Cash paid for income taxes	2,981us-gaap_IncomeTaxesPaidNet	3,401us-gaap_IncomeTaxesPaidNet
Noncash transactions - acquisition of property and equipment on account	155	82
Noncash transactions - issuance of performance shares, restricted and deferred stock units	$ 2,250	$ 3,007

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

+ Details

Name:	us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

+ Details

Name:	us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Aggregate cash proceeds received from a combination of transactions that are classified as investing activities in which assets, which may include one or more investments, are sold to third-party buyers. This element can be used by entities to aggregate proceeds from all asset sales that are classified as investing activities.

+ References

No definition available.

+ Details

Name:	us-gaap_ProceedsFromSalesOfAssetsInvestingActivities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_SupplementalCashFlowInformationAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration