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Financial Risk Management - Summary of Details of Financial Assets and Liabilities in Foreign Currencies (Detail) € in Thousands, ₫ in Thousands, ฿ in Thousands, ৳ in Thousands, دج in Thousands, ¥ in Thousands, ¥ in Thousands, £ in Thousands, zł in Thousands, Tsh in Thousands, SFr in Thousands, Rp in Thousands, P in Thousands, K in Thousands, FRw in Thousands, $ in Thousands, $ in Thousands, in Thousands, in Thousands, in Thousands, ₩ in Millions	Dec. 31, 2018 KRW (₩)	Dec. 31, 2018 BDT (৳)	Dec. 31, 2018 BWP (P)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2018 DZD (دج)	Dec. 31, 2018 GBP (£)	Dec. 31, 2018 IDR (Rp)	Dec. 31, 2018 EUR (€)	Dec. 31, 2018 JPY (¥)	Dec. 31, 2018 MMK (K)	Dec. 31, 2018 PLN (zł)	Dec. 31, 2018 RWF (FRw)	Dec. 31, 2018 TZS (Tsh)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 VND (₫)	Dec. 31, 2018 UZS ( )	Dec. 31, 2018 XDR ( )	Dec. 31, 2018 THB (฿)	Dec. 31, 2018 XAF ( )	Dec. 31, 2017 KRW (₩)	Dec. 31, 2017 BDT (৳)	Dec. 31, 2017 BWP (P)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2017 DZD (دج)	Dec. 31, 2017 GBP (£)	Dec. 31, 2017 IDR (Rp)	Dec. 31, 2017 EUR (€)	Dec. 31, 2017 JPY (¥)	Dec. 31, 2017 MMK (K)	Dec. 31, 2017 PLN (zł)	Dec. 31, 2017 RWF (FRw)	Dec. 31, 2017 TZS (Tsh)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 VND (₫)	Dec. 31, 2017 UZS ( )	Dec. 31, 2017 XDR ( )	Dec. 31, 2017 CHF (SFr)	Dec. 31, 2016 BDT (৳)	Dec. 31, 2016 BWP (P)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2016 DZD (دج)	Dec. 31, 2016 GBP (£)	Dec. 31, 2016 HKD ($)	Dec. 31, 2016 IDR (Rp)	Dec. 31, 2016 EUR (€)	Dec. 31, 2016 JPY (¥)	Dec. 31, 2016 MMK (K)	Dec. 31, 2016 PLN (zł)	Dec. 31, 2016 RWF (FRw)	Dec. 31, 2016 TZS (Tsh)	Dec. 31, 2016 USD ($)	Dec. 31, 2016 VND (₫)	Dec. 31, 2016 UZS ( )	Dec. 31, 2016 XDR ( )
Disclosure of detailed information about financial instruments [line items]
Financial assets	₩ 10,844,722																			₩ 10,387,651
Financial liabilities	₩ 15,334,068																			₩ 15,297,610
Currency risk [Member]
Disclosure of detailed information about financial instruments [line items]
Financial assets		৳ 39,494	P 897	¥ 16,315	دج 618		Rp 64,240,286	€ 2	¥ 66,078	K 84	zł 26	FRw 857		$ 279,327	₫ 467,272	121,053	267	฿ 1,685	666		৳ 38,074	P 42	¥ 46,555	دج 47		Rp 14,886,393	€ 186	¥ 28,267	K 84	zł 338	FRw 3,346	Tsh 317,348	$ 236,476	₫ 311,649	136,787	306		৳ 69,473	P 15	¥ 15,262	دج 471	£ 1	$ 254	Rp 15,646,011	€ 40	¥ 80,555	K 2,750	zł 106,025	FRw 1,203	Tsh 29,987	$ 210,474	₫ 515,412	39,531	311
Financial liabilities				¥ 271		£ 256	Rp 41,510,330	€ 6	¥ 50,000,000				Tsh 2,876	$ 1,893,782			730	฿ 1,685					¥ 10		£ 74	Rp 710,162	€ 3,625	¥ 21,801,443					$ 1,908,831			738	SFr 12			¥ 381		£ 151		Rp 53,142,167	€ 2,571	¥ 21,802,051					$ 2,536,090			737

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

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The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities]

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The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Financial instruments, class [member]; Financial assets; Derivatives [member]]

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