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Marketable Securities (Fair Value to Amortized Cost) (Details) - USD ($)
$ in Thousands

Sep. 30, 2015

Sep. 30, 2014

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale securities, amortized cost basis

$ 60,869

^[1]

$ 44,471

^[2]

Available-for-sale securities, unrealized gains

11

17

Available-for-sale securities, unrealized losses

(63)

(49)

Available-for-sale marketable securities, fair value

60,817

^[1]

44,439

^[2]

Purchased and accrued interest

252

629

Current Assets

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale securities, amortized cost basis

47,224

32,918

Available-for-sale securities, unrealized gains

8

3

Available-for-sale securities, unrealized losses

(40)

(23)

Available-for-sale marketable securities, fair value

47,192

32,898

Current Assets | Corporate bonds

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale securities, amortized cost basis

31,753

24,668

Available-for-sale securities, unrealized gains

0

1

Available-for-sale securities, unrealized losses

(39)

(22)

Available-for-sale marketable securities, fair value

31,714

24,647

Current Assets | Commercial paper

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale securities, amortized cost basis

7,986

3,998

Available-for-sale securities, unrealized gains

0

0

Available-for-sale securities, unrealized losses

(1)

(1)

Available-for-sale marketable securities, fair value

7,985

3,997

Current Assets | Certificates of deposit

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale securities, amortized cost basis

6,253

4,252

Available-for-sale securities, unrealized gains

8

2

Available-for-sale securities, unrealized losses

0

0

Available-for-sale marketable securities, fair value

6,261

4,254

Current Assets | Government municipal bonds

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale securities, amortized cost basis

1,232

Available-for-sale securities, unrealized gains

0

Available-for-sale securities, unrealized losses

0

Available-for-sale marketable securities, fair value

1,232

Non-current Assets

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale securities, amortized cost basis

13,645

11,553

Available-for-sale securities, unrealized gains

3

14

Available-for-sale securities, unrealized losses

(23)

(26)

Available-for-sale marketable securities, fair value

13,625

11,541

Non-current Assets | Corporate bonds

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale securities, amortized cost basis

4,138

2,051

Available-for-sale securities, unrealized gains

0

0

Available-for-sale securities, unrealized losses

(13)

(4)

Available-for-sale marketable securities, fair value

4,125

2,047

Non-current Assets | Certificates of deposit

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale securities, amortized cost basis

7,511

9,502

Available-for-sale securities, unrealized gains

3

14

Available-for-sale securities, unrealized losses

(7)

(22)

Available-for-sale marketable securities, fair value

7,507

$ 9,494

Non-current Assets | Government municipal bonds

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale securities, amortized cost basis

1,996

Available-for-sale securities, unrealized gains

0

Available-for-sale securities, unrealized losses

(3)

Available-for-sale marketable securities, fair value

$ 1,993

[1]	Included in amortized cost and fair value is purchased and accrued interest of $252.
[2]	Included in amortized cost and fair value is purchased and accrued interest of $629

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Available-for-sale Securities, Purchased and accrued interest

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

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