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Pension Termination (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 28, 2016
Jun. 30, 2016
Compensation and Retirement Disclosure [Abstract]    
Pension obligation that will be reclassified to earnings $ 9.4  
Actuarial loss to be reclassified to a regulatory asset for FERC reporting $ 5.1  
Regulatory asset, amortization period 16 years  
Cash payments to fully fund the Retirement Plan upon liquidation   $ 5.4