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Financial Assets Measured at Fair Value on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Sep. 30, 2013
Assets:    
Marketable securities available-for-sale $ 7,676 $ 7,107
Fair Value, Measurements, Recurring
   
Assets:    
Cash equivalents 3,902 [1] 685 [1]
Marketable securities available-for-sale 7,676 [2] 7,107 [2]
Total 11,578 7,792
Fair Value, Measurements, Recurring | Active Markets for Identical Instruments (Level 1)
   
Assets:    
Cash equivalents 3,902 [1] 685 [1]
Marketable securities available-for-sale 7,676 [2] 7,107 [2]
Total $ 11,578 $ 7,792
[1] Included in cash and cash equivalents on our condensed consolidated balance sheet at December 31, 2013 and September 30, 2013. Not included in this table are cash deposits of $92.0 million and $82.5 million at December 31, 2013 and September 30, 2013, 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 December 31, 2013 and September 30, 2013.