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Build-to-Suit Lease (Narrative) (Details) (USD $)
3 Months Ended 12 Months Ended
Sep. 30, 2012
Sep. 30, 2013
Build-to-Suit Lease (Additional Textual) [Abstract]    
Construction liability $ 2,421,000 $ 27,632,000
Depreciable Lives 18 years  
Investment to acquire equity interest   4,000,000
Equity interest in a joint venture (JV).   28.00%
Maximum tax rebate for property taxes as per tax increment financing arrangement   6,200,000
Build-to-Suit Lease [Member]
   
Build-to-Suit Lease (Additional Textual) [Abstract]    
Construction in progress   27,600,000
Construction liability   27,600,000
Lisle Illinois Campus [Member]
   
Build-to-Suit Lease (Additional Textual) [Abstract]    
Construction in progress   27,600,000
Lisle Illinois Campus [Member] | Land [Member]
   
Build-to-Suit Lease (Additional Textual) [Abstract]    
Operating Leases, Rent Expense   $ 300,000