Stock-Based Compensation - Long-term Incentive Plans (Details) shares in Thousands	Mar. 31, 2019 shares
2019/2020 | Awards Vesting in 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vested and expected to vest (in shares)	13
2019/2020 | Awards Vesting in 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vested and expected to vest (in shares)	53
2019/2020 | Awards Vesting in 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vested and expected to vest (in shares)	53
2019/2020 | Awards Vesting in 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vested and expected to vest (in shares)	54
2018/2019 | Awards Vesting in 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vested and expected to vest (in shares)	85
2018/2019 | Awards Vesting in 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vested and expected to vest (in shares)	58
2018/2019 | Awards Vesting in 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vested and expected to vest (in shares)	60
2017/2018 | Awards Vesting in 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vested and expected to vest (in shares)	224
2017/2018 | Awards Vesting in 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vested and expected to vest (in shares)	156
2017/2018 | Awards Vesting in 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vested and expected to vest (in shares)	0
2016/2017 | Awards Vesting in 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vested and expected to vest (in shares)	191