v3.5.0.1
Operating Segment and Geographic Information - Revenue from Continuing Operations by Geographic Region (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Apr. 30, 2016
 [1]
Jan. 31, 2016
Oct. 31, 2015
Jul. 31, 2015
Apr. 30, 2015
Jan. 31, 2015
Oct. 31, 2014
Jul. 31, 2014
Apr. 30, 2016
Apr. 30, 2015
Apr. 30, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue $ 50,709 $ 50,255 $ 49,926 $ 48,876 $ 48,317 $ 49,562 $ 47,325 $ 45,977 $ 199,766 $ 191,181 $ 168,145
Americas [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue                 150,758 146,086 127,766
EMEA [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue                 42,620 38,101 33,499
Other Geographic Area [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue                 $ 6,388 $ 6,994 $ 6,880
[1] During the fourth quarter of fiscal 2016, the Company recorded out of period adjustments related to errors in the timing of recognition of revenue, for which all required criteria had been satisfied in prior periods. The cumulative effect of out of period adjustments for the fourth quarter of fiscal 2016 was a $0.9 million increase in revenue. The Company has determined that these adjustments were not material to any prior annual or interim periods, and the resulting correction is not material to its annual results for fiscal 2016 or to the trend in earnings.