Cover [Abstract] Document Type Amendment Flag Entity Registrant Name Entity Central Index Key Messrs. Francis [Member] Beals [Member] Grant date fair value of stock awards granted in fiscal year. Grant Date Fair Value of Stock Awards Granted in Fiscal Year [Member] Fair value at fiscal year-end of outstanding unvested stock awards granted in fiscal year. Fair Value at Fiscal Year-End of Outstanding Unvested Stock Awards Granted in Fiscal Year [Member] Change in fair value of outstanding unvested stock awards granted in prior fiscal years. Change in Fair Value of Outstanding Unvested Stock Awards Granted in Prior Fiscal Years [Member] Fair value at vesting of stock awards granted in fiscal year that vested during fiscal year. Fair Value at Vesting of Stock Awards Granted in Fiscal Year that Vested During Fiscal Year [Member] Change in fair value as of vesting date of stock awards granted in prior fiscal years for which applicable vesting conditions were satisfied during fiscal year. Change in Fair Value as of Vesting Date of Stock Awards Granted in Prior Fiscal Years for which Applicable Vesting Conditions were Satisfied During Fiscal Year [Member] Fair value as of prior fiscal year-end of stock awards granted in prior fiscal years that failed to meet applicable vesting conditions during fiscal year. Fair Value as of Prior Fiscal Year-End of Stock Awards Granted in Prior Fiscal Years that Failed to Meet Applicable Vesting Conditions During Fiscal Year [Member] Reported value of equity awards. Reported Value of Equity Awards [Member] Equity award adjustments. Equity Award Adjustments [Member] Average year end fair value of equity awards. Average Year End Fair Value of Equity Awards [Member] Year over year average change in fair value of outstanding and unvested equity awards. Year over Year Average Change in Fair Value of Outstanding and Unvested Equity Awards [Member] Average fair value as of vesting date of equity awards granted and vested in the year. Average Fair Value as of Vesting Date of Equity Awards Granted and Vested in the Year [Member] Year over year average change in fair value of equity awards granted in prior years that vested in the year. Year over Year Average Change in Fair Value of Equity Awards Granted in Prior Years that Vested in the Year [Member] Average fair value at the end of the prior year of equity awards that failed to meet vesting conditions in the year. Average Fair Value at the End of the Prior Year of Equity Awards that Failed to Meet Vesting Conditions in the Year [Member]