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Other Events (Details) $ / shares in Units, $ in Thousands, $ in Millions		1 Months Ended		3 Months Ended
	Dec. 06, 2019 USD ($) $ / shares	Apr. 30, 2019 MXN ($)	Jul. 31, 2018 MXN ($)	Jan. 31, 2020 USD ($)	Jan. 31, 2019 USD ($)
Dividend declared per share | $ / shares	$ 1.10
Dividend amount paid to shareholders | $	$ 19,400			$ 19,354	$ 17,568
Mexican Tax Authority [Member]
Employee profit sharing liability			$ 118	6,200
Tax Year 2011 [Member] | Mexican Tax Authority [Member]
Final tax assessment related to Income Tax, Flat Rate Business Tax, and Value Added Tax		$ 2,200		116,400
Tax Year 2013 [Member] | Mexican Tax Authority [Member]
Final tax assessment related to Income Tax, Flat Rate Business Tax, and Value Added Tax			$ 2,600	$ 137,500

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Aggregate dividends paid during the period for each share of common stock outstanding.

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The amount of the additional liability or refund received or expected based on a final settlement with a taxing authority.

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Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement.

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