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Financial Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Sep. 30, 2014
Assets:    
Marketable securities available-for-sale $ 9,907 $ 8,751
Cash deposits 83,900 94,700
Fair Value, Measurements, Recurring    
Assets:    
Cash equivalents [1] 439 10,326
Marketable securities available-for-sale [2] 9,907 8,751
Total 10,346 19,077
Fair Value, Measurements, Recurring | Active Markets for Identical Instruments (Level 1)    
Assets:    
Cash equivalents [1] 439 10,326
Marketable securities available-for-sale [2] 9,907 8,751
Total $ 10,346 $ 19,077
[1] Included in cash and cash equivalents on our condensed consolidated balance sheet at June 30, 2015 and September 30, 2014. Not included in these tables are cash deposits of $83.9 million and $94.7 million at June 30, 2015 and September 30, 2014, 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, 2015 and September 30, 2014.