Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Summary of Estimated Useful Lives or Expected Lease Term (Detail)

v2.4.1.9
Summary of Significant Accounting Policies - Summary of Estimated Useful Lives or Expected Lease Term (Detail)
 12 Months Ended
Jan. 31, 2015
Equipment and Fixtures [Member] | Minimum [Member]  
Property, Plant and Equipment [Line Items]  
Estimated useful lives or the expected lease term 3 years
Equipment and Fixtures [Member] | Maximum [Member]  
Property, Plant and Equipment [Line Items]  
Estimated useful lives or the expected lease term 10 years
Leasehold Improvements [Member]  
Property, Plant and Equipment [Line Items]  
Estimated useful lives or the expected lease term 10 years
Leasehold Improvements [Member] | Average [Member]  
Property, Plant and Equipment [Line Items]  
Estimated useful lives or the expected lease term 10 years
Electronic Equipment and Software [Member] | Minimum [Member]  
Property, Plant and Equipment [Line Items]  
Estimated useful lives or the expected lease term 3 years
Electronic Equipment and Software [Member] | Maximum [Member]  
Property, Plant and Equipment [Line Items]  
Estimated useful lives or the expected lease term 5 years