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Cost Savings Initiatives (Details Textual) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jul. 31, 2017	Jan. 31, 2018
Restructuring Cost And Reserve [Line Items]
Cost savings initiative	$ 6,419
Cost Savings Initiatives
Restructuring Cost And Reserve [Line Items]
Cost savings initiative		$ 13,600

X

- Definition

Cost savings initiative charges.

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Period Type:	duration

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: