Summary of Significant Accounting Policies - Details (Details) - Accounting Standards Update 2015-03 $ in Millions |
Jul. 31, 2016
USD ($)
|
|---|---|
| Other long-term assets | |
| Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] | |
| Debt finance costs, net | $ (1.6) |
| Long-term debt | |
| Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] | |
| Debt finance costs, net | $ 1.6 |