Intangible Assets and Goodwill - Estimated Annual Amortization Expense (Details) |
Jan. 31, 2016
USD ($)
|
|---|---|
| Estimated annual amortization expense of intangible assets for next five years | |
| Six month period ending July 31, 2016 | $ 6,448,000 |
| 2017 | 12,572,000 |
| 2018 | 12,272,000 |
| 2019 | 11,948,000 |
| 2020 | 10,192,000 |
| 2021 | $ 9,839,000 |