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Intangible Assets and Goodwill - Estimated Annual Amortization Expense (Details)
Apr. 30, 2016
USD ($)
Estimated annual amortization expense of intangible assets for next five years  
Three month period ending July 31, 2016 $ 3,405,000
2017 13,458,000
2018 13,157,000
2019 12,833,000
2020 11,077,000
2021 $ 10,720,000