Restaurant Information by Ownership Type (Detail) - Restaurant	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Number of Restaurants	36,905	36,467
Franchised
Segment Reporting Information [Line Items]
Number of Restaurants	31,328	30,197
Franchised | Conventional franchised
Segment Reporting Information [Line Items]
Number of Restaurants	21,168	21,209
Franchised | Developmental licensed
Segment Reporting Information [Line Items]
Number of Restaurants	6,800	5,618
Franchised | Affiliated
Segment Reporting Information [Line Items]
Number of Restaurants	3,360	3,370
Company-operated
Segment Reporting Information [Line Items]
Number of Restaurants	5,577	6,270