Investment Securities Available for Sale (Maturity Dates of Marketable Debt Securities) (Details) $ in Thousands	Sep. 30, 2017 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Market Value	$ 85,534
Under 1 Year	17,055
1 Year up to 5 Years	62,979
More than 5 Years	5,500
U.S. Government securities
Schedule of Available-for-sale Securities [Line Items]
Market Value	28,696
Under 1 Year	0
1 Year up to 5 Years	28,696
More than 5 Years	0
Corporate securities
Schedule of Available-for-sale Securities [Line Items]
Market Value	40,372
Under 1 Year	9,079
1 Year up to 5 Years	31,293
More than 5 Years	0
U.S. mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Market Value	5,089
Under 1 Year	0
1 Year up to 5 Years	22
More than 5 Years	5,067
Commercial mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Market Value	433
Under 1 Year	0
1 Year up to 5 Years	0
More than 5 Years	433
Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Market Value	7,976
Under 1 Year	7,976
1 Year up to 5 Years	0
More than 5 Years	0
Index-linked U.S. bonds
Schedule of Available-for-sale Securities [Line Items]
Market Value	2,314
Under 1 Year	0
1 Year up to 5 Years	2,314
More than 5 Years	0
Foreign fixed-income securities
Schedule of Available-for-sale Securities [Line Items]
Market Value	654
Under 1 Year	0
1 Year up to 5 Years	654
More than 5 Years	$ 0

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
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