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Property, Plant and Equipment - Disclosure of Summary about Property, Plant and Equipment (Detail)
₨ in Millions, $ in Millions
12 Months Ended
Mar. 31, 2018
INR (₨)
Mar. 31, 2018
USD ($)
Mar. 31, 2017
INR (₨)
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance ₨ 69,794    
Capital work-in-progress 15,680   ₨ 8,951
Assets reclassified as held for sale (514)    
Ending balance 64,443 $ 990 69,794
Carrying value [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 156,542   144,068
Translation adjustment 1,387   (1,591)
Additions/ adjustments 15,745   19,970
Acquisition through business combinations 29   1,492
Disposals/ adjustments (8,658)   (7,397)
Assets reclassified as held for sale (32,130)    
Ending balance 132,915   156,542
Accumulated depreciation/impairment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 95,699   85,327
Translation adjustment 662   (928)
Depreciation 16,869   17,114
Disposals/ adjustments (7,710)   (5,814)
Assets reclassified as held for sale (21,882)    
Ending balance 83,638   95,699
Land [member] | Carrying value [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 3,814   3,695
Translation adjustment 28   (15)
Additions/ adjustments 2    
Acquisition through business combinations     134
Assets reclassified as held for sale (207)    
Ending balance 3,637   3,814
Buildings [member] | Carrying value [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 27,581   26,089
Translation adjustment 265   (69)
Additions/ adjustments 1,197   1,133
Acquisition through business combinations 13   446
Disposals/ adjustments (190)   (18)
Assets reclassified as held for sale (3,721)    
Ending balance 25,145   27,581
Buildings [member] | Accumulated depreciation/impairment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 6,361   5,344
Translation adjustment 49   (39)
Depreciation 1,023   1,059
Disposals/ adjustments (70)   (3)
Assets reclassified as held for sale (1,539)    
Ending balance 5,824   6,361
Plant and machinery [member] | Carrying value [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 108,967   99,580
Translation adjustment 904   (1,377)
Additions/ adjustments 11,767   16,572
Acquisition through business combinations 4   835
Disposals/ adjustments (7,302)   (6,643)
Assets reclassified as held for sale (27,118)    
Ending balance 87,222   108,967
Plant and machinery [member] | Accumulated depreciation/impairment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 77,005   68,161
Translation adjustment 509   (816)
Depreciation 14,078   14,910
Disposals/ adjustments (6,640)   (5,250)
Assets reclassified as held for sale (19,627)    
Ending balance 65,325   77,005
Furniture fixtures and equipment [member] | Carrying value [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 15,748   14,115
Translation adjustment 188   (133)
Additions/ adjustments 1,776   2,242
Acquisition through business combinations 11   77
Disposals/ adjustments (872)   (553)
Assets reclassified as held for sale (1,079)    
Ending balance 15,772   15,748
Furniture fixtures and equipment [member] | Accumulated depreciation/impairment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 11,968   11,318
Translation adjustment 104   (75)
Depreciation 1,381   1,117
Disposals/ adjustments (758)   (392)
Assets reclassified as held for sale (712)    
Ending balance 11,983   11,968
Vehicles [member] | Carrying value [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 432   589
Translation adjustment 2   3
Additions/ adjustments 1,003   23
Acquisition through business combinations 1    
Disposals/ adjustments (294)   (183)
Assets reclassified as held for sale (5)    
Ending balance 1,139   432
Vehicles [member] | Accumulated depreciation/impairment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 365   504
Translation adjustment     2
Depreciation 387   28
Disposals/ adjustments (242)   (169)
Assets reclassified as held for sale (4)    
Ending balance ₨ 506   ₨ 365