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Fair Value Measurements - Financial Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Sep. 30, 2016
Assets:    
Marketable securities $ 12,224 $ 11,016
Cash deposits 115,400 75,500
Fair Value, Measurements, Recurring    
Assets:    
Cash equivalents [1] 441 440
Marketable securities [2] 12,224 11,016
Total 12,665 11,456
Fair Value, Measurements, Recurring | Active Markets for Identical Instruments (Level 1)    
Assets:    
Cash equivalents [1] 441 440
Marketable securities [2] 12,224 11,016
Total $ 12,665 $ 11,456
[1] Included in cash and cash equivalents on our condensed consolidated balance sheet at March 31, 2017 and September 30, 2016. Not included in these tables are cash deposits of $115.4 million and $75.5 million at March 31, 2017 and September 30, 2016, 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, 2017 and September 30, 2016.