Fair Value Measurements (Tables)

3 Months Ended

Dec. 31, 2017

Fair Value Disclosures [Abstract]

Financial Assets Measured on a Recurring Basis

The following tables represent financial assets that we measured at fair value on a recurring basis at December 31, 2017 and September 30, 2017:

December 31, 2017	Active Markets for Identical Instruments (Level 1)		Fair Value as of December 31, 2017
	(In thousands)
Assets:
Cash equivalents (1)	$	4,105	$	4,105
Marketable securities (2)	15,816		15,816
Total	$	19,921	$	19,921
September 30, 2017	Active Markets for Identical Instruments (Level 1)		Fair Value as of September 30, 2017
	(In thousands)
Assets:
Cash equivalents (1)	$	15,295	$	15,295
Marketable securities (2)	13,791		13,791
Total	$	29,086	$	29,086

(1) Included in cash and cash equivalents on our condensed consolidated balance sheet at December 31, 2017 and September 30, 2017. Not included in these tables are cash deposits of $90.1 million and $90.3 million at December 31, 2017 and September 30, 2017, respectively.

(2) Represents securities held under a supplemental retirement and savings plan for senior management employees, which are distributed upon termination or retirement of the employees. Included in marketable securities on our condensed consolidated balance sheet at December 31, 2017 and September 30, 2017.