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Fair Value Measurements - Financial Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Sep. 30, 2015
Assets:    
Marketable securities available-for-sale $ 10,351 $ 9,567
Cash deposits 84,900 85,700
Fair Value, Measurements, Recurring    
Assets:    
Cash equivalents [1] 440 439
Marketable securities available-for-sale [2] 10,351 9,567
Total 10,791 10,006
Fair Value, Measurements, Recurring | Active Markets for Identical Instruments (Level 1)    
Assets:    
Cash equivalents [1] 440 439
Marketable securities available-for-sale [2] 10,351 9,567
Total $ 10,791 $ 10,006
[1] Included in cash and cash equivalents on our condensed consolidated balance sheet at March 31, 2016 and September 30, 2015. Not included in these tables are cash deposits of $84.9 million and $85.7 million at March 31, 2016 and September 30, 2015, 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 available for sale on our condensed consolidated balance sheet at March 31, 2016 and September 30, 2015.