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Recent accounting pronouncements (Tables)
 12 Months Ended
Jan. 31, 2017
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]  
New accounting pronouncement, early adoption
The net impact on previously reported results is as follows:
Fiscal year ended January 31, 2016
As originally reported
 
As Adjusted
Net cash provided by operations
$
228,596

 
$
231,250

Net cash used in financing activities
$
(69,907
)
 
$
(72,561
)
 
 
 
 
Fiscal year ended January 31, 2015
As originally reported
 
As Adjusted
Net cash provided by operations
$
138,208

 
$
140,839

Net cash used in financing activities
$
(69,054
)
 
$
(71,685
)