Stock-Based Compensation (Details 4) - Time-Based	1 Months Ended
	May 31, 2017	Feb. 28, 2017	Jan. 31, 2017
Employee | First Vesting Period | Incentive Program Bonus Award Fiscal Year Performance | Nonvested shares
Stock-based compensation
Vesting (as a percent)		33.33%
Employee | First Vesting Period | Incentive Program Bonus Award Fiscal Year Performance | Nonvested share units
Stock-based compensation
Vesting (as a percent)		33.33%	33.33%
Employee | Second Vesting Period | Incentive Program Bonus Award Fiscal Year Performance | Nonvested shares
Stock-based compensation
Vesting (as a percent)		33.33%
Employee | Second Vesting Period | Incentive Program Bonus Award Fiscal Year Performance | Nonvested share units
Stock-based compensation
Vesting (as a percent)		33.33%	33.33%
Employee | Third Vesting Period | Incentive Program Bonus Award Fiscal Year Performance | Nonvested shares
Stock-based compensation
Vesting (as a percent)		33.33%
Employee | Third Vesting Period | Incentive Program Bonus Award Fiscal Year Performance | Nonvested share units
Stock-based compensation
Vesting (as a percent)		33.33%	33.33%
Maximum | Director | Nonvested share units
Stock-based compensation
Award vesting period	1 year