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Cumulative Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 4 Months Ended 8 Months Ended 12 Months Ended
Sep. 30, 2015
Jun. 05, 2015
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Balance beginning $ 4,082 $ 230,244 $ 213,652 $ 230,244 $ 109,512
Other comprehensive income (loss) 189 (460) 19 (271) (138)
Balance ending 213,652 4,082 246,391 213,652 230,244
Unrealized Gain (Loss) On Available For Sale Securities          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Balance beginning   (37) 0 (37) 0
Other comprehensive income (loss) before reclassifications     0 (54) (37)
Amounts reclassified from cumulative other comprehensive income (loss) to net income (loss)     0   0
Other comprehensive income (loss)     0 (54) (37)
Reorganization of equity structure       0  
Reductions for securities sold during the period       91  
Investments distributed to ABP Trust during the period       0  
Balance ending 0   0 0 (37)
Equity in Unrealized Gain (Loss) of An Investee          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Balance beginning   56 0 56 32
Other comprehensive income (loss) before reclassifications     0 35 56
Amounts reclassified from cumulative other comprehensive income (loss) to net income (loss)     0   (32)
Other comprehensive income (loss)     0 35 24
Reorganization of equity structure       0  
Reductions for securities sold during the period       0  
Investments distributed to ABP Trust during the period       (91)  
Balance ending 0   0 0 56
Foreign Currency Translation Adjustments          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Balance beginning   (205) 189 (205) (80)
Other comprehensive income (loss) before reclassifications     19 (252) (125)
Amounts reclassified from cumulative other comprehensive income (loss) to net income (loss)     0   0
Other comprehensive income (loss)     19 (252) (125)
Reorganization of equity structure       646  
Reductions for securities sold during the period       0  
Investments distributed to ABP Trust during the period       0  
Balance ending 189   208 189 (205)
Total          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Balance beginning   $ (186) 189 (186) (48)
Other comprehensive income (loss) before reclassifications     19 (271) (106)
Amounts reclassified from cumulative other comprehensive income (loss) to net income (loss)     0   (32)
Other comprehensive income (loss)     19 (271) (138)
Reorganization of equity structure       646  
Reductions for securities sold during the period       91  
Investments distributed to ABP Trust during the period       (91)  
Balance ending $ 189   $ 208 $ 189 $ (186)