Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impairment of long-lived assets (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impairment of long-lived assets (Details) - CNY (¥)
9 Months Ended 12 Months Ended
Dec. 31, 2017
Mar. 31, 2017
Mar. 31, 2016
Impairment of long-lived assets, excluding goodwill      
Impairment loss of intangible assets ¥ 0 ¥ 0 ¥ 0
Goodwill      
Impairment loss of goodwill ¥ 0 ¥ 0 ¥ 0