Shareholder Rights Plan - Additional Information (Detail) (USD $)	12 Months Ended
	Mar. 31, 2015
Equity [Abstract]
Shareholder rights exercise price	$ 118
Shareholder rights purchase	Fidelity Management & Research Company and its affiliates to purchase up to 18% of the shares of common stock of the Company without triggering the stockholder rights.
Shareholder rights purchase, percentage	18.00%
Shareholder rights expiration date	Feb. 10, 2022
Shareholder Rights Plan, description of acquired entity	Shareholder Rights Plan provides that if a person or group acquires 15% or more of the Company's common stock
Shareholder Rights Plan, percentage of acquired entity	15.00%
Shareholder Rights Plan, description of merged entity	Company is thereafter merged into another entity, or if 50% or more of the Company's consolidated assets or earning power are sold, then the right will entitle its holder to buy common shares of the acquiring entity having a market value equal to two times the then-current exercise price of the right.
Shareholder Rights Plan, percentage of merged entity	50.00%