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.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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Name:	us-gaap_SeveranceCosts1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Significant Transactions During the Three Months Ended April 27, 2019 (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended	12 Months Ended
	Jul. 31, 2019	Apr. 27, 2019	Apr. 27, 2019	Jul. 31, 2019
Selling, General and Administrative Expenses [Member]
Staff Reduction Programs [Abstract]
Employee severance and termination costs		$ 0.8
Selling, General and Administrative Expenses [Member] \| U.S. Operations [Member]
Expenses Associated with Restatements of Financial Statements [Abstract]
Incremental audit, tax and legal expenses		$ 0.6	$ 0.9
Forecast [Member]
Staff Reduction Programs [Abstract]
Expected savings due to staff reduction and expense reduction initiatives				$ 6.0
Employee severance and termination costs	$ 0.1