Recent Accounting Pronouncements - Additional Information (Details) - Accounting Standards Update 2015-03 [Member] $ in Millions	Oct. 31, 2016 USD ($)
Current Assets [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Reclassification of debt issuance costs to be direct deduction of current portion of debt	$ 0.3
Other Assets, Net [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Reclassification of debt issuance costs to be direct deduction of long-term debt and other liabilities	$ 1.1