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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Investments in debt and equity securities which are categorized neither as held-to-maturity nor trading and which are intended to be sold or mature more than one year from the balance sheet date or operating cycle, if longer. Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain (loss) of an Available-for-sale security that is designated as being hedged in a fair value hedge is recognized in earnings during the period of the hedge, as are other than temporary declines in fair value below the cost basis for investments in equity securities and debt securities that an entity intends to sell or it is more likely than not that it will be required to sell before the recovery of its amortized cost basis. Other than temporary declines in fair value below the cost basis for debt securities categorized as Available-for-sale that an entity does not intend to sell and for which it is not more likely than not that the entity will be required to sell before the recovery of its amortized cost basis are bifurcated into credit losses and losses related to all other factors. Other than temporary declines in fair value below cost basis related to credit losses are recognized in earnings, and losses related to all other factors are recognized in other comprehensive income.

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The carrying amount of consideration received or receivable as of the balance sheet date on potential earnings that were not recognized as revenue in conformity with GAAP, and which are expected to be recognized as such within one year or the normal operating cycle, if longer, including sales, license fees, and royalties, but excluding interest income.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Sum of the carrying amounts as of the balance sheet date of all investments.

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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Aggregate carrying amount, as of the balance sheet date, of noncurrent assets not separately disclosed in the balance sheet. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer).

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Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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Summary Of Significant Accounting Policies (Narrative) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended						6 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2014	Mar. 31, 2013	Jun. 30, 2014	Jun. 30, 2013	Sep. 30, 2014 segment	Sep. 30, 2013	Sep. 30, 2012
Summary Of Significant Accounting Policies [Line Items]
Primary business segments											3us-gaap_NumberOfOperatingSegments
Deferred contract revenue	$ 16,970us-gaap_DeferredRevenueCurrent	$ 14,420us-gaap_DeferredRevenueCurrent	$ 14,372us-gaap_DeferredRevenueCurrent	$ 14,646us-gaap_DeferredRevenueCurrent	$ 15,213us-gaap_DeferredRevenueCurrent	$ 15,865us-gaap_DeferredRevenueCurrent	$ 14,420us-gaap_DeferredRevenueCurrent	$ 15,213us-gaap_DeferredRevenueCurrent	$ 16,970us-gaap_DeferredRevenueCurrent	$ 14,646us-gaap_DeferredRevenueCurrent	$ 14,750us-gaap_DeferredRevenueCurrent	$ 14,509us-gaap_DeferredRevenueCurrent	$ 15,866us-gaap_DeferredRevenueCurrent
Research and development expense											5,813us-gaap_ResearchAndDevelopmentExpense	4,121us-gaap_ResearchAndDevelopmentExpense	3,957us-gaap_ResearchAndDevelopmentExpense
Advertising expense											1,191us-gaap_AdvertisingExpense	1,339us-gaap_AdvertisingExpense	920us-gaap_AdvertisingExpense
Net cash provided by operating activities			9,939			4,122	19,880	8,970	26,551	19,381	36,685	25,349	36,405
Net cash used by investing activities			(2,948)			(3,771)	(4,329)	(6,475)	(5,711)	(10,490)	(7,216)	(11,679)	(125,425)
Net income	(36,034)us-gaap_ProfitLoss	4,476us-gaap_ProfitLoss	4,029us-gaap_ProfitLoss	(13,518)us-gaap_ProfitLoss	4,506us-gaap_ProfitLoss	4,430us-gaap_ProfitLoss	8,505us-gaap_ProfitLoss	8,936us-gaap_ProfitLoss	(27,529)us-gaap_ProfitLoss	(4,582)us-gaap_ProfitLoss	(24,698)us-gaap_ProfitLoss	3,636us-gaap_ProfitLoss	19,374us-gaap_ProfitLoss
Stock-based compensation expense			282			625	453	1,504	1,066	2,293	2,074	2,541	2,413
Reporting segements											3us-gaap_NumberOfReportableSegments
Income tax benefit recognized related to stock-based compensation											774	981	901
Weighted-average fair value granted											$ 47.97
Other current assets	3,164	2,994	3,070	2,421	1,928	2,015	2,994	1,928	3,164	2,421	1,973	1,869	1,561
Other long-term assets											12,034us-gaap_OtherAssetsNoncurrent	10,832us-gaap_OtherAssetsNoncurrent
Long-term investments											3,734us-gaap_Investments	2,977us-gaap_Investments
Long-term investments classified as available-for-sale securities											2,382	2,188
Restricted Cash [Member]
Summary Of Significant Accounting Policies [Line Items]
Other current assets											162	162
Other long-term assets											$ 0	$ 162
Buildings [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life											30 years
Equipment [Member] \| Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life											3 years
Equipment [Member] \| Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life											8 years
Internal Software [Member] \| Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life											5 years
Dosimetry Devices, Principally Badges, And Software [Member] \| Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life											30 months
Dosimetry Devices, Principally Badges, And Software [Member] \| Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life											8 years