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Unrecognized tax benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Beginning balance $ 170,654 $ 149,878 $ 152,845
Increases related to acquisitions 46,245 8,381 341
Decreases related to settlements with tax authorities (7,954) (20,197) (15,016)
Decreases related to statute of limitation expirations (4,591) (9,031) (4,069)
Increases related to current year tax positions 16,315 23,179 14,669
Increases related to prior year tax positions 0 18,444 1,108
Ending balance 220,669 170,654 149,878
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued [Abstract]      
Unrecognized Tax Benefits, Interest on Income Taxes Accrued 2,400 700  
Unrecognized Tax Benefits, Income Tax Penalties Accrued 27,600    
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense 1,700 $ (1,800) $ 200
Increase in unrecognized tax benefits related to prior year tax positions balance sheet reclassification $ 15,700