Investment Securities Available for Sale (Maturity Dates of Marketable Debt Securities) (Details) $ in Thousands	Sep. 30, 2016 USD ($)
U.S. Government securities
Schedule of Available-for-sale Securities [Line Items]
Market Value	$ 30,985
Under 1 Year	0
1 Year up to 5 Years	30,985
More than 5 Years	0
Corporate securities
Schedule of Available-for-sale Securities [Line Items]
Market Value	35,669
Under 1 Year	3,366
1 Year up to 5 Years	31,871
More than 5 Years	432
U.S. mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Market Value	8,293
Under 1 Year	0
1 Year up to 5 Years	819
More than 5 Years	7,474
Commercial mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Market Value	1,776
Under 1 Year	0
1 Year up to 5 Years	0
More than 5 Years	1,776
U.S. asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Market Value	891
Under 1 Year	0
1 Year up to 5 Years	891
More than 5 Years	0
Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Market Value	19,424
Under 1 Year	19,424
1 Year up to 5 Years	0
More than 5 Years	0
Total marketable debt securities by maturity dates
Schedule of Available-for-sale Securities [Line Items]
Market Value	97,038
Under 1 Year	22,790
1 Year up to 5 Years	64,566
More than 5 Years	$ 9,682

Fair value of available-for-sale debt securities maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 320
-Section 50
-Paragraph 3
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-URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803

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Fair value of available-for-sale debt securities maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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