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Commitments and Contingencies Lease Reserve Rollforward (Details 3) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2016
Jun. 30, 2016
Sep. 30, 2016
Mar. 31, 2016
Mar. 31, 2015
Vacated Office Space [Member]          
Schedule of Lease Reserve Liability Rollforward [Line Items]          
Lease Liability Related To Space Permanentely Abandonded $ 48,591   $ 48,591 $ 52,240 $ 45,939
Valuation Allowances and Reserves, Charged to Cost and Expense [1],[2]     9,069 14,642  
Rental Payments, Net of Sublease Income     (8,278) (12,689)  
Valuation Allowances and Reserves, Additions for Adjustments     (4,440) 4,348  
Adjustments to Lease Liability Related to Vacant Space (2,306) $ (2,700)      
EnTrustPermal [Member] | Commitments Related to Vacated Space that Remains Vacant [Member]          
Schedule of Lease Reserve Liability Rollforward [Line Items]          
Lease Liability Related To Space Permanentely Abandonded $ 9,069   $ 9,069 $ 7,212  
[1] Included in Occupancy expense in the Consolidated Statements of Income
[2] Includes $9,069 and $7,212 related to the restructuring of Permal for the combination with EnTrust for the six months ended September 30, 2016 and the year ended March 31, 2016, respectively. See Note 3 for additional information.