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Accrued Severance Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Jul. 31, 2016	Jan. 31, 2017
Accrued Severance Expense (Textual)
Severance expense	$ 6.3
July 2016 workforce reduction [Member]
Accrued Severance Expense (Textual)
Accrued severance	$ 5.7	$ 2.3

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Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 210
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Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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