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Recent accounting pronouncements (Tables)
 6 Months Ended
Jul. 31, 2016
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]  
New accounting pronouncement, early adoption
The net impact on previously reported results is as follows:
Six months ended July 31, 2015
As originally reported
 
As Adjusted
Net cash provided by operations
$
94,807

 
$
94,812

Net cash used in financing activities
$
(6,582
)
 
$
(6,587
)