Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Jul. 31, 2021	Jan. 31, 2021	Jul. 31, 2020
Assets:
Total assets measured at fair value	$ 77,350	$ 73,461	$ 72,409
Liabilities:
Total liabilities measured at fair value	47,886	46,686	45,043
Level 1
Assets:
Total assets measured at fair value	49,153	47,624	46,274
Liabilities:
Total liabilities measured at fair value	47,886	46,673	45,043
Level 2
Assets:
Total assets measured at fair value	140	0	228
Liabilities:
Total liabilities measured at fair value	0	13	0
Level 3
Assets:
Total assets measured at fair value	28,057	25,837	25,907
Liabilities:
Total liabilities measured at fair value	0	0	0
Other Current Assets | Available-for-sale securities
Assets:
Total assets measured at fair value	218	184	141
Other Current Assets | Short-term investment
Assets:
Total assets measured at fair value	167	162	155
Other Current Assets | Hedge derivatives-Assets
Assets:
Total assets measured at fair value	140		228
Other Current Assets | Level 1 | Available-for-sale securities
Assets:
Total assets measured at fair value	218	184	141
Other Current Assets | Level 1 | Short-term investment
Assets:
Total assets measured at fair value	167	162	155
Other Current Assets | Level 1 | Hedge derivatives-Assets
Assets:
Total assets measured at fair value	0		0
Other Current Assets | Level 2 | Available-for-sale securities
Assets:
Total assets measured at fair value	0	0	0
Other Current Assets | Level 2 | Short-term investment
Assets:
Total assets measured at fair value	0	0	0
Other Current Assets | Level 2 | Hedge derivatives-Assets
Assets:
Total assets measured at fair value	140		228
Other Current Assets | Level 3 | Available-for-sale securities
Assets:
Total assets measured at fair value	0	0	0
Other Current Assets | Level 3 | Short-term investment
Assets:
Total assets measured at fair value	0	0	0
Other Current Assets | Level 3 | Hedge derivatives-Assets
Assets:
Total assets measured at fair value	0		0
Other Non-current Assets | SERP assets - employer
Assets:
Total assets measured at fair value	882	605	935
Other Non-current Assets | SERP assets - employee
Assets:
Total assets measured at fair value	47,886	46,673	45,043
Other Non-current Assets | Level 1 | SERP assets - employer
Assets:
Total assets measured at fair value	882	605	935
Other Non-current Assets | Level 1 | SERP assets - employee
Assets:
Total assets measured at fair value	47,886	46,673	45,043
Other Non-current Assets | Level 2 | SERP assets - employer
Assets:
Total assets measured at fair value	0	0	0
Other Non-current Assets | Level 2 | SERP assets - employee
Assets:
Total assets measured at fair value	0	0	0
Other Non-current Assets | Level 3 | SERP assets - employer
Assets:
Total assets measured at fair value	0	0	0
Other Non-current Assets | Level 3 | SERP assets - employee
Assets:
Total assets measured at fair value	0	0	0
Other non-current liabilities | SERP liabilities - employee
Liabilities:
Total liabilities measured at fair value	47,886	46,673	45,043
Other non-current liabilities | Defined Benefit Plan Assets
Assets:
Total assets measured at fair value	28,057	25,837	25,907
Other non-current liabilities | Level 1 | SERP liabilities - employee
Liabilities:
Total liabilities measured at fair value	47,886	46,673	45,043
Other non-current liabilities | Level 1 | Defined Benefit Plan Assets
Assets:
Total assets measured at fair value	0	0	0
Other non-current liabilities | Level 2 | SERP liabilities - employee
Liabilities:
Total liabilities measured at fair value	0	0	0
Other non-current liabilities | Level 2 | Defined Benefit Plan Assets
Assets:
Total assets measured at fair value	0	0	0
Other non-current liabilities | Level 3 | SERP liabilities - employee
Liabilities:
Total liabilities measured at fair value	0	0	0
Other non-current liabilities | Level 3 | Defined Benefit Plan Assets
Assets:
Total assets measured at fair value	$ 28,057	25,837	$ 25,907
Accrued Liabilities | Hedge derivatives-Liabilities
Liabilities:
Total liabilities measured at fair value		13
Accrued Liabilities | Level 1 | Hedge derivatives-Liabilities
Liabilities:
Total liabilities measured at fair value		0
Accrued Liabilities | Level 2 | Hedge derivatives-Liabilities
Liabilities:
Total liabilities measured at fair value		13
Accrued Liabilities | Level 3 | Hedge derivatives-Liabilities
Liabilities:
Total liabilities measured at fair value		$ 0