Summary of Significant Accounting Policies - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Oct. 31, 2015	Jan. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Amount	$ 215,128	$ 29,155
U.S. Revolver Borrowings
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Amount	148,800
Revolving Credit Facility | U.S. Revolver Borrowings
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Amount	148,845	0
Fair Value	148,750	0
Revolving Credit Facility | UK Revolver Borrowings
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Amount	27,015	0
Fair Value	26,845	0
Line of Credit | UK Term Loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Amount	39,268	29,155
Fair Value	$ 39,197	$ 29,126