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Fair Value Measurements - Financial Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Sep. 30, 2016
Assets:    
Marketable securities $ 13,049 $ 11,016
Cash deposits 117,200 75,500
Fair Value, Measurements, Recurring    
Assets:    
Cash equivalents [1] 13,449 440
Marketable securities [2] 13,049 11,016
Total 26,498 11,456
Fair Value, Measurements, Recurring | Active Markets for Identical Instruments (Level 1)    
Assets:    
Cash equivalents [1] 13,449 440
Marketable securities [2] 13,049 11,016
Total $ 26,498 $ 11,456
[1] Included in cash and cash equivalents on our condensed consolidated balance sheet at June 30, 2017 and September 30, 2016. Not included in these tables are cash deposits of $117.2 million and $75.5 million at June 30, 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 June 30, 2017 and September 30, 2016.