XML 64 R54.htm IDEA: XBRL DOCUMENT v3.7.0.1
Intangibles and Goodwill - Estimated Annual Amortization Expense (Details)
Apr. 30, 2017
USD ($)
Estimated annual amortization expense of intangible assets for next five years  
Three month period ending July 31, 2017 $ 4,031,000
2018 15,892,000
2019 15,568,000
2020 13,815,000
2021 13,483,000
2022 $ 12,746,000