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

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Balance Type:	debit
Period Type:	instant