Stock-Based Compensation - Phantom (Details)	9 Months Ended
	Oct. 31, 2014
Deferred Awards | Tranche One
Share-based Compensation Arrangement by Share-based Payment Award
Vesting percentage	25.00%
Deferred Awards | Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award
Vesting percentage	25.00%
Deferred Awards | Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award
Vesting percentage	50.00%
Performance Awards | Tranche One
Share-based Compensation Arrangement by Share-based Payment Award
Vesting percentage	25.00%
Performance Awards | Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award
Vesting percentage	25.00%
Performance Awards | Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award
Vesting percentage	50.00%