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Permanent Equity - Summary of Consolidated Statements of Permanent Equity and Comprehensive Income (Loss) (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2010
Schedule of Capitalization, Equity [Line Items]      
Beginning Balances $ 149,448 $ (5,195) $ 6,568
Gross change before reclassification adjustment 879,066 394,971 (33,251)
Net reclassification adjustment for losses (gains) included in earnings (259,924) 9,569 7,711
Gross change after reclassification adjustment 619,142 404,540 (25,540)
Intangible assets adjustment (217,868) (172,263)  
Deferred tax effect (145,143) (83,704) 12,764
Deferred tax valuation allowance 126 2,706 (2,398)
Noncontrolling interest 8,520 3,681 (3,322)
Net adjustment to AOCI 264,777 154,960 (18,496)
Change in noncontrolling interest (1,053) (317) 6,733
Total Cumulative components at September 30, 2011 413,172 149,448 (5,195)
Ending Balances 413,172 149,448 (5,195)
After reclassification [Member]
      
Schedule of Capitalization, Equity [Line Items]      
Beginning Balances 149,448    
Gross amounts (after reclassification adjustments) 1,015,210 396,068  
Intangible assets adjustment (390,131) (172,263)  
Tax effects (226,149) (81,132)  
Noncontrolling interest   6,775  
Noncontrolling interest 14,242    
Total Cumulative components at September 30, 2011 413,172 149,448  
Ending Balances 413,172 149,448  
Unrealized Investment Gains, net [Member]
      
Schedule of Capitalization, Equity [Line Items]      
Beginning Balances 159,302    
Gross change before reclassification adjustment 906,473 420,929  
Net reclassification adjustment for losses (gains) included in earnings (263,948) (3,861)  
Gross change after reclassification adjustment 642,525 417,068  
Intangible assets adjustment (218,454) (172,057)  
Deferred tax effect (148,469) (85,709)  
Net adjustment to AOCI 275,602 159,302  
Total Cumulative components at September 30, 2011 434,904 159,302  
Ending Balances 434,904 159,302  
Unrealized Investment Gains, net [Member] | After reclassification [Member]
      
Schedule of Capitalization, Equity [Line Items]      
Beginning Balances 159,302    
Gross amounts (after reclassification adjustments) 1,059,593 417,068  
Intangible assets adjustment (390,511) (172,057)  
Tax effects (234,178) (85,709)  
Total Cumulative components at September 30, 2011 434,904 159,302  
Ending Balances 434,904 159,302  
Non-Credit Related Other-than-temporary Impairments [Member]
      
Schedule of Capitalization, Equity [Line Items]      
Beginning Balances 191    
Gross change before reclassification adjustment (1,529) 500  
Gross change after reclassification adjustment (1,529) 500  
Intangible assets adjustment 586 (206)  
Deferred tax effect 330 (103)  
Net adjustment to AOCI (613) 191  
Total Cumulative components at September 30, 2011 (422) 191  
Ending Balances (422) 191  
Non-Credit Related Other-than-temporary Impairments [Member] | After reclassification [Member]
      
Schedule of Capitalization, Equity [Line Items]      
Beginning Balances 191    
Gross amounts (after reclassification adjustments) (1,029) 500  
Intangible assets adjustment 380 (206)  
Tax effects 227 (103)  
Total Cumulative components at September 30, 2011 (422) 191  
Ending Balances (422) 191  
Other Unrealized Gains (Losses) - Cash Flow Hedges [Member]
      
Schedule of Capitalization, Equity [Line Items]      
Beginning Balances (705) (3,137) 851
Gross change before reclassification adjustment (1,824) (5,992) (15,621)
Net reclassification adjustment for losses (gains) included in earnings 3,097 13,422 6,356
Gross change after reclassification adjustment 1,273 7,430 (9,265)
Deferred tax effect (636) (2,671) 2,775
Deferred tax valuation allowance 908 (331) (116)
Noncontrolling interest (736) (2,128) 1,276
Net adjustment to AOCI 809 2,300 (5,330)
Change in noncontrolling interest 21 132 1,342
Total Cumulative components at September 30, 2011 125 (705) (3,137)
Ending Balances 125 (705) (3,137)
Other Unrealized Gains (Losses) - Cash Flow Hedges [Member] | After reclassification [Member]
      
Schedule of Capitalization, Equity [Line Items]      
Beginning Balances (705)    
Gross amounts (after reclassification adjustments) 305 (968)  
Tax effects (87) (359)  
Noncontrolling interest   622  
Noncontrolling interest (93)    
Total Cumulative components at September 30, 2011 125 (705)  
Ending Balances 125 (705)  
Actuarial Adjustments to Pension Plans [Member]
      
Schedule of Capitalization, Equity [Line Items]      
Beginning Balances (13,788) (12,404) (190)
Gross change before reclassification adjustment (15,452) (7,609) (29,141)
Net reclassification adjustment for losses (gains) included in earnings 927 8 1,355
Gross change after reclassification adjustment (14,525) (7,601) (27,786)
Deferred tax effect 3,632 2,037 8,904
Deferred tax valuation allowance (782) 3,529 (2,763)
Noncontrolling interest 5,074 373 8,084
Net adjustment to AOCI (6,601) (1,662) (13,561)
Change in noncontrolling interest (917) 278 1,347
Total Cumulative components at September 30, 2011 (21,306) (13,788) (12,404)
Ending Balances (21,306) (13,788) (12,404)
Actuarial Adjustments to Pension Plans [Member] | After reclassification [Member]
      
Schedule of Capitalization, Equity [Line Items]      
Beginning Balances (13,788)    
Gross amounts (after reclassification adjustments) (39,937) (25,412)  
Tax effects 4,392 1,542  
Noncontrolling interest   10,082  
Noncontrolling interest 14,239    
Total Cumulative components at September 30, 2011 (21,306) (13,788)  
Ending Balances (21,306) (13,788)  
Cumulative Translation Adjustments [Member]
      
Schedule of Capitalization, Equity [Line Items]      
Beginning Balances 4,448 10,346 5,907
Gross change before reclassification adjustment (8,602) (12,857) 11,511
Gross change after reclassification adjustment (8,602) (12,857) 11,511
Deferred tax effect   2,742 1,085
Deferred tax valuation allowance   (492) 481
Noncontrolling interest 4,182 5,436 (12,682)
Net adjustment to AOCI (4,420) (5,171) 395
Change in noncontrolling interest (157) (727) 4,044
Total Cumulative components at September 30, 2011 (129) 4,448 10,346
Ending Balances (129) 4,448 10,346
Cumulative Translation Adjustments [Member] | After reclassification [Member]
      
Schedule of Capitalization, Equity [Line Items]      
Beginning Balances 4,448    
Gross amounts (after reclassification adjustments) (3,722) 4,880  
Tax effects 3,497 3,497  
Noncontrolling interest   (3,929)  
Noncontrolling interest 96    
Total Cumulative components at September 30, 2011 (129) 4,448  
Ending Balances $ (129) $ 4,448