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Weighted-Average Assumptions Used to Value Option Awards (Detail) - Long Term Compensation Plan [Member] - Stock Options [Member]
6 Months Ended
Sep. 30, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Dividend Yield 1.30%
Expected Volatility 36.50%
Risk Free Interest Rate 1.40%
Expected Life 6 years