Commitments and Contingencies - Narrative - Legal Matters (Details)		3 Months Ended		6 Months Ended		12 Months Ended
	Apr. 03, 2013 USD ($)	May. 31, 2015 USD ($) LegalMatter	May. 31, 2014 USD ($)	May. 31, 2015 USD ($) LegalMatter	May. 31, 2014 USD ($)	Nov. 30, 2011 USD ($) LegalMatter plantiff	Jan. 16, 2015 USD ($) citation	Dec. 18, 2014 USD ($)	Nov. 30, 2013 employee
Loss Contingencies [Line Items]
Legal fees and expenses		$ 0	$ 100,000	$ (700,000)	$ 100,000
Asbestos Litigation [Member]
Loss Contingencies [Line Items]
Unresolved asbestos cases pending | LegalMatter		83		83
Accrued estimated liability		$ 0		$ 0
AMEC PLC [Member] | Asbestos Litigation [Member]
Loss Contingencies [Line Items]
Unresolved asbestos cases pending | LegalMatter						16
Number of plaintiffs | plantiff						271
Reimbursement of legal fees and expenses						$ 1,700,000
Legal fees and expenses	$ 3,000,000
Litigation liability accrued		200,000		200,000
Expenditures recoverable				0
Inflective, Inc. [Member]
Loss Contingencies [Line Items]
Litigation liability accrued		0		0
Damages								$ 3,000,000
James Chavez, Andrew Baca, and Spouses [Member]
Loss Contingencies [Line Items]
Litigation liability accrued		$ 0		$ 0
Rancho Cordova Facility [Member] | State of California, Division of Occupational Safety & Health [Member] | Occupational Safety [Member]
Loss Contingencies [Line Items]
Damages							$ 100,000
Number of injured employees | employee									2
Number of citations | citation							9