. we also rebalanced our skill mix , including the addition of more than 18000 new employees and the ongoing retraining of the existing workforce . in real estate , we restructured over four million square feet of space during fiscal 2018 . costs of services fiscal 2018 compared with fiscal 2017 cost of services excluding depreciation and amortization and restructuring costs ( "cos" ) was $ 17.9 billion for fiscal 2018 as compared to $ 5.5 billion for fiscal 2017