Subsequent Event (Details)					3 Months Ended															12 Months Ended
	May. 20, 2016	Jun. 02, 2015 USD ($)	May. 28, 2015	Aug. 01, 2013	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Jun. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Sep. 30, 2013 USD ($)	Jun. 30, 2013 USD ($)	Mar. 31, 2013 USD ($)	Mar. 31, 2015 USD ($)
Subsequent Event [Line Items]
Minimum consolidated interest coverage ratio																				1.50
Maximum consolidated interest coverage ratio																		5.85
Unused lines of credit											$ 669,428,000									$ 669,428,000
Applicable Ratio, Period One [Member]
Subsequent Event [Line Items]
Minimum consolidated interest coverage ratio																				1.60
Maximum consolidated interest coverage ratio														7.60
Applicable Ratio, Period Two [Member]
Subsequent Event [Line Items]
Minimum consolidated interest coverage ratio																				1.65
Maximum consolidated interest coverage ratio												7.15
Applicable Ratio, Period Three [Member]
Subsequent Event [Line Items]
Minimum consolidated interest coverage ratio																				1.70
Maximum consolidated interest coverage ratio											5.85
Subsequent Event [Member]
Subsequent Event [Line Items]
Reverse stock split ratio			0.1000
Available Credit Line And Cash							$ 604,500,000
Cash							189,200,000
Subsequent Event [Member] | Third Amendment [Member]
Subsequent Event [Line Items]
Cap on early repayment of senior debt		$ 50,000,000
Period to remedy uncommitted inventories excess		90 days
Threshold for uncommitted inventories		$ 250,000,000
Maximum threshold for uncommitted inventories		$ 285,000,000
Subsequent Event [Member] | Third Amendment [Member] | Applicable Ratio, Period One [Member]
Subsequent Event [Line Items]
Minimum consolidated interest coverage ratio		1.60
Maximum consolidated interest coverage ratio		7.60
Subsequent Event [Member] | Third Amendment [Member] | Applicable Ratio, Period Two [Member]
Subsequent Event [Line Items]
Minimum consolidated interest coverage ratio		1.65
Maximum consolidated interest coverage ratio		7.15
Subsequent Event [Member] | Third Amendment [Member] | Applicable Ratio, Period Three [Member]
Subsequent Event [Line Items]
Minimum consolidated interest coverage ratio		1.70
Kenyan Subsidiary [Member] | Fourth Amendment to Amended and Restated Credit Agreement [Member]
Subsequent Event [Line Items]
Kenyan Discrepancies											$ 3,577,392	$ 449,593	$ 6,606,350	$ 1,834,281	$ 7,869,112	$ 4,681,765	$ (1,492,481)	$ 2,198,708	$ (1,745,717)
Legal and Professional Costs in Respect of Kenyan Discrepancies											$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0
Scenario, Forecast [Member] | Kenyan Subsidiary [Member] | Fourth Amendment to Amended and Restated Credit Agreement [Member]
Subsequent Event [Line Items]
Kenyan Discrepancies					$ 0	$ 0	0	$ 0	$ 5,821,224	$ 5,263,723
Legal and Professional Costs in Respect of Kenyan Discrepancies					$ 3,500,000	$ 4,000,000	6,129,000	$ 1,771,000	$ 0	$ 0
Line of Credit [Member] | Third Amendment [Member]
Subsequent Event [Line Items]
Debt Instrument, Covenant Terms, Consolidated Interest Ratio				1.90
Debt Instrument, Covenant Terms, Consolidated Leverage Ratio				5.10
Line of Credit [Member] | Subsequent Event [Member] | Fourth Amendment to Amended and Restated Credit Agreement [Member] | Applicable Ratio, Period Two [Member]
Subsequent Event [Line Items]
Debt Instrument, Covenant Terms, Consolidated Interest Ratio	1.65
Debt Instrument, Covenant Terms, Consolidated Leverage Ratio	5.50
Revolving Credit Facility [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Unused lines of credit							10,300,000
Line of Credit [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Unused lines of credit							415,300,000
Foreign Seasonal Credit [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Unused lines of credit							405,000,000
Letter of Credit [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Unused lines of credit							$ 13,100,000