Stock Option Plan - Summary of Weighted-Average Fair Value of Options Granted (Detail)	12 Months Ended
Jan. 31, 2019 CAD ($) yr	Jan. 31, 2018 CAD ($) yr
Disclosure of weighted average fair value and main assumptions [abstract]
Weighted-average fair value at grant date	$ 18.02	$ 11.66
Share price	$ 60.48	$ 39.93
Risk-free interest rate	2.20%	1.16%
Expected life \| yr	6.25	6.25
Expected volatility	27.64%	30.43%
Expected annual dividend per share	0.60%	0.80%

Disclosure of weighted average fair value and main assumptions.

No definition available.

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- Definition

The expected volatility of the share price used to calculate the fair value of the share options granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2018-01-01
-Paragraph 47
-Subparagraph a
-Clause i
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_47_a_i&doctype=Standard
-URIDate 2018-03-16

+ Details

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- Definition

The option life of share options granted.

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+ Details

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- Definition

The implied yield currently available on zero-coupon government issues of the country in whose currency the exercise price for share options granted is expressed, with a remaining term equal to the expected term of the option being valued (based on the option's remaining contractual life and taking into account the effects of expected early exercise). [Refer: Government [member]]

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+ Details

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- Definition

The percentage of an expected dividend used to calculate the fair value of share options granted.

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+ Details

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- Definition

The weighted average fair value of share options granted during the period at the measurement date. [Refer: Weighted average [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2018-01-01
-Paragraph 47
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_47_a&doctype=Standard
-URIDate 2018-03-16

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- Definition

The weighted average share price used as input to the option pricing model to calculate the fair value of share options granted. [Refer: Option pricing model [member]; Weighted average [member]]

+ References

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