Subsequent Events	12 Months Ended
Mar. 31, 2016
Subsequent Events [Abstract]
Subsequent Events	SUBSEQUENT EVENTS On April 15, 2016, the Company announced it has elected to redeem all $250 million of its outstanding 2.95% Notes maturing in June 2016 (“2016 Notes”). The notes will be redeemed in full on May 15, 2016, at a price of 100%. On April 26, 2016, the Company announced the commencement of a consent solicitation, at the request and expense of Air Liquide, relating to all of its outstanding senior notes, excluding its 2016 Notes which the Company has elected to redeem on May 15, 2016, (“Affected Notes”) in connection with the previously announced merger with Air Liquide (see Note 2). The Company solicited the consents of holders of Affected Notes to amend the indenture dated as of May 27, 2010 between the Company and U.S. Bank National Association, as trustee, as amended and supplemented from time to time (the "Indenture"), to modify the reporting covenants with respect to the Affected Notes so that, following the closing of the Merger, in the event that (and for so long as) Air Liquide provides an unconditional guarantee of the Company's payment obligations under the Indenture and the Affected Notes, Air Liquide will provide its periodic and current reporting (under applicable French law) in lieu of the Company's existing periodic and current reporting obligations. Air Liquide has no obligation to guarantee the Affected Notes, and there can be no assurance that Air Liquide will do so. On May 10, 2016 the Company announced that holders of a majority in aggregate principal amount of Affected Notes have delivered valid consents in connection with the Company’s proposed amendments (the “Amendments”) to the Indenture. The terms and conditions of the Amendments are set forth in the consent solicitation statement dated April 26, 2016, as supplemented by a supplement dated May 2, 2016 (together, the “Statement”). The Company will, subject to the satisfaction or waiver of certain conditions described in the Statement, including the closing of the Merger, promptly pay to each holder of Affected Notes who delivered (and did not revoke) a valid consent in favor of the Amendments prior to 5:00 p.m., New York City time, on May 9, 2016, a cash payment of $1.50 for each $1,000 principal amount of Affected Notes in respect of which such holder delivered (and did not revoke) a valid consent.

SUBSEQUENT EVENTS

On April 15, 2016, the Company announced it has elected to redeem all $250 million of its outstanding 2.95% Notes maturing in June 2016 (“2016 Notes”). The notes will be redeemed in full on May 15, 2016, at a price of 100%.

On April 26, 2016, the Company announced the commencement of a consent solicitation, at the request and expense of Air Liquide, relating to all of its outstanding senior notes, excluding its 2016 Notes which the Company has elected to redeem on May 15, 2016, (“Affected Notes”) in connection with the previously announced merger with Air Liquide (see Note 2). The Company solicited the consents of holders of Affected Notes to amend the indenture dated as of May 27, 2010 between the Company and U.S. Bank National Association, as trustee, as amended and supplemented from time to time (the "Indenture"), to modify the reporting covenants with respect to the Affected Notes so that, following the closing of the Merger, in the event that (and for so long as) Air Liquide provides an unconditional guarantee of the Company's payment obligations under the Indenture and the Affected Notes, Air Liquide will provide its periodic and current reporting (under applicable French law) in lieu of the Company's existing periodic and current reporting obligations. Air Liquide has no obligation to guarantee the Affected Notes, and there can be no assurance that Air Liquide will do so. On May 10, 2016 the Company announced that holders of a majority in aggregate principal amount of Affected Notes have delivered valid consents in connection with the Company’s proposed amendments (the “Amendments”) to the Indenture. The terms and conditions of the Amendments are set forth in the consent solicitation statement dated April 26, 2016, as supplemented by a supplement dated May 2, 2016 (together, the “Statement”). The Company will, subject to the satisfaction or waiver of certain conditions described in the Statement, including the closing of the Merger, promptly pay to each holder of Affected Notes who delivered (and did not revoke) a valid consent in favor of the Amendments prior to 5:00 p.m., New York City time, on May 9, 2016, a cash payment of $1.50 for each $1,000 principal amount of Affected Notes in respect of which such holder delivered (and did not revoke) a valid consent.