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Fair Value Measurements (detail) - USD ($)
Dec. 31, 2016
Mar. 31, 2016
Fair Value Disclosures [Abstract]    
Long-term Debt, Gross $ 351,272,000 $ 315,539,000
Long-term Debt, Fair Value 351,544,000 315,478,000
Capital Lease Obligations, Gross 29,461,000 5,231,000
Capital Lease Obligations, Fair Value $ 27,303,000 $ 5,076,000