Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

No definition available.

Name:	us-gaap_OtherCommitment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Commitments and Contingencies - Compensation Agreements (Details) - Compensation agreements - USD ($)	Oct. 31, 2016	Jul. 31, 2016
Total contractual obligations
Other commitment	$ 11,071,000
Former CEO retirement obligation
Total contractual obligations
Other commitment		$ 4,500,000